USA flag An official website of the United States government  v

HDPWS

Data Access

ICON Ion Velocity Meter Data

(2023). ICON Ion Velocity Meter Data. [Data set]. NASA Space Physics Data Facility. https://doi.org/10.48322/2mv5-xy46. Accessed on .

Note: Proper references, including or other formats, should include the "Accessed on date" to identify the version of the resource being cited in a given publication.

ResourceID
spase://NASA/NumericalData/ICON/IVM/L2/PT1S

Description
The IVM consists of two planar thermal ion sensors, a retarding potential analyzer (RPA) and an ion drift meter (IDM).

View XML | Edit

Details

Version:2.5.0

NumericalData

ResourceID
spase://NASA/NumericalData/ICON/IVM/L2/PT1S
ResourceHeader
ResourceName
ICON Ion Velocity Meter Data
AlternateName
IVM Data
DOI
https://doi.org/10.48322/2mv5-xy46
ReleaseDate
2023-08-01 00:00:00Z
RevisionHistory
RevisionEvent
ReleaseDate
2023-08-01 00:00:00Z
Note
Added DOI and PublicationInfo minted by JMW on 20230801. Updated SPASE version.
Description
The IVM consists of two planar thermal ion sensors, a retarding potential analyzer (RPA) and an ion drift meter (IDM).
Acknowledgement
National Aeronautics and Space Administration; Dr. Roderick A. Heelis; Dr. Thomas Immel
PublicationInfo
Authors
Heelis, R. A.
PublicationDate
2023-01-01 00:00:00
PublishedBy
NASA Space Physics Data Facility
Funding
Agency
National Aeronautics and Space Administration
Project
Explorers Program
AwardNumber
contracts NNG12FA44C
Contacts
Role Person StartDate StopDate Note
1. PrincipalInvestigator spase://SMWG/Person/Roderick.A.Heelis
InformationURL
Name
Additional information on ICON
URL
https://icon.ssl.berkeley.edu/
Description
ICON spacecraft Homepage.
InformationURL
Name
Ion Velocity Measurements for the Ionospheric Connections Explorer
URL
https://doi.org/10.1007/s11214-017-0383-3
Description
Space Science Reviews, 212(1-2), pp.615-629. DOI: 10.1007/s11214-017-0383-3
AccessInformation
RepositoryID
spase://SMWG/Repository/NASA/GSFC/CDAW
Availability
Online
AccessRights
Open
AccessURL
Name
HTTPS from CDAWeb
URL
https://cdaweb.gsfc.nasa.gov/pub/data/icon/l2/
Description
FTPS access to ICON data via ftps at the Space Physics Data Facility (SPDF)
Format
NetCDF
AccessInformation
RepositoryID
spase://SMWG/Repository/NASA/GSFC/SPDF
Availability
Online
AccessRights
Open
AccessURL
Name
HTTPS from SPDF
URL
https://spdf.gsfc.nasa.gov/pub/data/icon/l2/
Description
HTTPS access to ICON data at the Space Physics Data Facility (SPDF)
Format
NetCDF
ProcessingLevel
Calibrated
ProviderName
ICON Ion Velocity Meter team
InstrumentIDs
spase://SMWG/Instrument/ICON/IVM
MeasurementType
Dopplergram
TemporalDescription
TimeSpan
StartDate
2019-12-06 00:00:00Z
RelativeStopDate
-P2M
Cadence
PT30S
ObservedRegion
Earth.NearSurface.Atmosphere
ObservedRegion
Earth.NearSurface.Ionosphere
Parameter #1
Name
Epoch time
ParameterKey
Epoch
Description
Time at the midpoint of the IVM measurements.
Cadence
PT1S
Units
ms
ValidMin
NaN
ValidMax
NaN
FillValue
-9223372036854775808
Support
Qualifier
Magnitude
SupportQuantity
Temporal
Parameter #2
Name
Binary Coded Integer Describing the Activity Category of IVM-A
ParameterKey
ICON_L27_A_Activity
Description
Binary Coded Integer from Technical Note ICN-TN-027. 1: Earth Day View 2: Earth Night View 4: Calibration Target View 8: Off-target View 16: Sun Proximity View 32: Moon Proximity View 64: North Magnetic Footpoint View 128: South Magnetic Footpoint View 256: Science Data Collection View 512: Calibration Data Collection View 1024: RAM Proximity View.
Cadence
PT30S
ValidMin
0
ValidMax
2047
FillValue
-999
Support
Qualifier
Scalar
SupportQuantity
Other
Parameter #3
Name
Binary Coded Integer Describing the View Status of IVM-A
ParameterKey
ICON_L27_A_Status
Description
Binary Coded Integer from Technical Note ICN-TN-027. 1: Earth Day View 2: Earth Night View 4: Calibration Target View 8: Off-target View 16: Sun Proximity View 32: Moon Proximity View 64: North Magnetic Footpoint View 128: South Magnetic Footpoint View 256: Science Data Collection View 512: Calibration Data Collection View 1024: RAM Proximity View.
Cadence
PT1S
ValidMin
0
ValidMax
2047
FillValue
-999
Support
Qualifier
Scalar
SupportQuantity
InstrumentMode
Parameter #4
Name
WGS84 Altitude of Spacecraft Position (geodetic)
ParameterKey
ICON_L27_Altitude
Description
Geodetic Altitude of Spacecraft in WGS84.
Cadence
PT1S
Units
km
ValidMin
0
ValidMax
1000
FillValue
-999.900024
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #5
Name
Modified APEX Height
ParameterKey
ICON_L27_Apex_Height
Description
Modified APEX height for S/C position.
Cadence
PT1S
Units
km
ValidMin
0
ValidMax
1000
FillValue
-999.900024
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #6
Name
Attitude Status
ParameterKey
ICON_L27_Attitude_Status
Cadence
PT1S
FillValue
9969209968386869046778552952102584320.000000
Support
Qualifier
Scalar
SupportQuantity
Other
Parameter #7
Name
Binary Coded Integer Describing the Activity Category of IVM-B
ParameterKey
ICON_L27_B_Activity
Description
Binary Coded Integer from Technical Note ICN-TN-027. 1: Earth Day View 2: Earth Night View 4: Calibration Target View 8: Off-target View 16: Sun Proximity View 32: Moon Proximity View 64: North Magnetic Footpoint View 128: South Magnetic Footpoint View 256: Science Data Collection View 512: Calibration Data Collection View 1024: RAM Proximity View.
Cadence
PT30S
ValidMin
0
ValidMax
2047
FillValue
-999
Support
Qualifier
Scalar
SupportQuantity
Other
Parameter #8
Name
Binary Coded Integer Describing the View Status of IVM-B
ParameterKey
ICON_L27_B_Status
Description
Binary Coded Integer from Technical Note ICN-TN-027. 1: Earth Day View 2: Earth Night View 4: Calibration Target View 8: Off-target View 16: Sun Proximity View 32: Moon Proximity View 64: North Magnetic Footpoint View 128: South Magnetic Footpoint View 256: Science Data Collection View 512: Calibration Data Collection View 1024: RAM Proximity View 2048-32768: SPARE
Cadence
PT1S
ValidMin
0
ValidMax
2047
FillValue
-999
Support
Qualifier
Scalar
SupportQuantity
InstrumentMode
Parameter #9
Name
Flag for Drift Meter Quality
ParameterKey
ICON_L27_DM_Flag
Description
Drift meter quality flag. 0 - Good data. 1 - Data may have artifacts due to s/c operations. 2 - Data temporarily removed for photoemission. 3 - Not enough O+ to measure arrival angle.
Cadence
PT1S
ValidMin
0
ValidMax
2047
FillValue
-999
Support
Qualifier
Scalar
SupportQuantity
DataQuality
Parameter #10
Name
Equatorial Meridional Ion Velocity
ParameterKey
ICON_L27_Equator_Ion_Velocity_Meridional
Description
Velocity along local magnetic meridional direction, perpendicular to geomagnetic field and within local magnetic meridional plane, field-line mapped to apex/magnetic equator. The meridional vector is purely vertical at the magnetic equator, positive up. Velocity obtained using ion velocities relative to co-rotation in the instrument frame along with the corresponding unit vectors expressed in the instrument frame. Field-line mapping and the assumption of equi-potential field lines is used to translate the locally measured ion motion to the magnetic equator. The mapping is used to determine the change in magnetic field line distance, which, under assumption of equipotential field lines, in turn alters the electric field at that location (E=V/d).
Cadence
PT30S
Units
m/s
ValidMin
-500.00
ValidMax
500.00
FillValue
-999.900024
Particle
ParticleType
Molecule
Qualifier
Magnitude
ParticleQuantity
FlowVelocity
Parameter #11
Name
Equatorial Zonal Ion Velocity
ParameterKey
ICON_L27_Equator_Ion_Velocity_Zonal
Description
Velocity along local magnetic zonal direction, perpendicular to geomagnetic field and the local magnetic meridional plane, field-line mapped to apex/magnetic equator. The zonal vector is purely horizontal when mapped to the magnetic equator, positive is generally eastward. Velocity obtained using ion velocities relative to co-rotation in the instrument frame along with the corresponding unit vectors expressed in the instrument frame. Field-line mapping and the assumption of equi-potential field lines is used to translate the locally measured ion motion to the magnetic equator. The mapping is used to determine the change in magnetic field line distance, which, under assumption of equipotential field lines, in turn alters the electric field at that location (E=V/d).
Cadence
PT30S
Units
m/s
ValidMin
-500.00
ValidMax
500.00
FillValue
-999.900024
Particle
ParticleType
Molecule
Qualifier
Magnitude
ParticleQuantity
FlowVelocity
Parameter #12
Name
Altitude of Northern Magnetic Footpoint
ParameterKey
ICON_L27_Footpoint_Altitude_North
Description
Altitude location of the magnetic footpoint in Northern Hemisphere at 150 km. These data were interpolated using tricubic algorithm from IGRF and ephemeris data then linearly interploted to IVM times. These values should all be 150 km.
Cadence
PT1S
Units
km
ValidMin
150
ValidMax
150
FillValue
-999.900024
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #13
Name
Altitude of Southern Magnetic Footpoint
ParameterKey
ICON_L27_Footpoint_Altitude_South
Description
Altitude location of the magnetic footpoint in Northern Hemisphere at 150 km. These data were interpolated using tricubic algorithm from IGRF and ephemeris data then linearly interploted to IVM times. These values should all be 150 km.
Cadence
PT1S
Units
km
ValidMin
150
ValidMax
150
FillValue
-999.900024
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #14
Name
X-component of Field Aligned Drift
ParameterKey
ICON_L27_Footpoint_Field_Aligned_Vector_ECEF_X_North
Description
At the northern footpoint this is the x-component of the unit vector for field aligned ion drifts expressed in the Earth-Centered, Earth-Fixed frame.
Cadence
PT1S
Units
dimensionless
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
ECEF
ValidMin
-1
ValidMax
1
FillValue
-999.900024
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #15
Name
X-component of Field Aligned Drift
ParameterKey
ICON_L27_Footpoint_Field_Aligned_Vector_ECEF_X_South
Description
At the Southern footpoint this is the y-component of the unit vector for field aligned ion drifts expressed in the Earth-Centered, Earth-Fixed frame.
Cadence
PT1S
Units
dimensionless
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
ECEF
ValidMin
-1
ValidMax
1
FillValue
-999.900024
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #16
Name
Y-component of field aligned drift
ParameterKey
ICON_L27_Footpoint_Field_Aligned_Vector_ECEF_Y_North
Description
At the northern footpoint this is the y-component of the unit vector for field aligned ion drifts expressed in the Earth-Centered, Earth-Fixed frame.
Cadence
PT1S
Units
dimensionless
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
ECEF
ValidMin
-1
ValidMax
1
FillValue
-999.900024
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #17
Name
Y-component of field aligned drift
ParameterKey
ICON_L27_Footpoint_Field_Aligned_Vector_ECEF_Y_South
Description
At the Southern footpoint this is the y-component of the unit vector for field aligned ion drifts expressed in the Earth-Centered, Earth-Fixed frame.
Cadence
PT1S
Units
dimensionless
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
ECEF
ValidMin
-1
ValidMax
1
FillValue
-999.900024
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #18
Name
Z-component of field aligned drift
ParameterKey
ICON_L27_Footpoint_Field_Aligned_Vector_ECEF_Z_North
Description
At the northern footpoint this is the z-component of the unit vector for field aligned ion drifts expressed in the Earth-Centered, Earth-Fixed frame.
Cadence
PT1S
Units
dimensionless
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
ECEF
ValidMin
-1
ValidMax
1
FillValue
-999.900024
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #19
Name
Z-component of field aligned drift
ParameterKey
ICON_L27_Footpoint_Field_Aligned_Vector_ECEF_Z_South
Description
At the Southern footpoint this is the z-component of the unit vector for field aligned ion drifts expressed in the Earth-Centered, Earth-Fixed frame.
Cadence
PT1S
Units
dimensionless
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
ECEF
ValidMin
-1
ValidMax
1
FillValue
-999.900024
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #20
Name
Latitude of Northern Magnetic Footpoint
ParameterKey
ICON_L27_Footpoint_Latitude_North
Description
Latitude location of the magnetic footpoint in Northern Hemisphere at 150 km. These data were interpolated using tricubic algorithm from IGRF and ephemeris data then linearly interploted to IVM times.
Cadence
PT1S
Units
degrees
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
MAG
ValidMin
-65
ValidMax
65
FillValue
-999.900024
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #21
Name
Latitude of Southern Magnetic Footpoint
ParameterKey
ICON_L27_Footpoint_Latitude_South
Description
Latitude location of the magnetic footpoint in Southern Hemisphere at 150 km. These data were interpolated using tricubic algorithm from IGRF and ephemeris data then linearly interploted to IVM times.
Cadence
PT1S
Units
degrees
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
MAG
ValidMin
-65
ValidMax
65
FillValue
-999.900024
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #22
Name
Longitude of Northern Magnetic Footpoint
ParameterKey
ICON_L27_Footpoint_Longitude_North
Description
Longitude location of the magnetic footpoint in Northern Hemisphere at 150 km. These data were interpolated using tricubic algorithm from IGRF and ephemeris data then linearly interploted to IVM times.
Cadence
PT1S
Units
degrees
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
MAG
ValidMin
-180
ValidMax
180
FillValue
-999.900024
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #23
Name
Longitude of Southern Magnetic Footpoint
ParameterKey
ICON_L27_Footpoint_Longitude_South
Description
Longitude location of the magnetic footpoint in Southern Hemisphere at 150 km. These data were interpolated using tricubic algorithm from IGRF and ephemeris data then linearly interploted to IVM times.
Cadence
PT1S
Units
degrees
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
MAG
ValidMin
-180
ValidMax
180
FillValue
-999.900024
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #24
Name
Quesi Dipole Latitude of Northern Footpoint
ParameterKey
ICON_L27_Footpoint_Magnetic_Latitude_North
Description
Calculated value of quesi dipole latitude of northern footpoint from IGRF.
Cadence
PT1S
Units
degrees
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
MAG
ValidMin
-90
ValidMax
90
FillValue
-999.900024
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #25
Name
Quesi Dipole Latitude of Southern Footpoint
ParameterKey
ICON_L27_Footpoint_Magnetic_Latitude_South
Description
Calculated value of quesi dipole latitude of southern footpoint from IGRF.
Cadence
PT1S
Units
degrees
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
MAG
ValidMin
-90
ValidMax
90
FillValue
-999.900024
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #26
Name
Quesi Dipole Longitude of Northern Footpoint
ParameterKey
ICON_L27_Footpoint_Magnetic_Longitude_North
Description
Calculated value of quesi dipole longitude of northern footpoint from IGRF.
Cadence
PT1S
Units
degrees
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
MAG
ValidMin
-180
ValidMax
180
FillValue
-999.900024
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #27
Name
Quesi Dipole Longitude of Southern Footpoint
ParameterKey
ICON_L27_Footpoint_Magnetic_Longitude_South
Description
Calculated value of quesi dipole longitude of southern footpoint from IGRF.
Cadence
PT1S
Units
degrees
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
MAG
ValidMin
-180
ValidMax
180
FillValue
-999.900024
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #28
Name
Northern Meridional Ion Velocity
ParameterKey
ICON_L27_Footpoint_Meridional_Ion_Velocity_North
Description
Velocity along local magnetic meridional direction, perpendicular to geomagnetic field and within local magnetic meridional plane, field-line mapped to northern footpoint. The meridional vector is purely vertical at the magnetic equator, positive up. Velocity obtained using ion velocities relative to co-rotation in the instrument frame along with the corresponding unit vectors expressed in the instrument frame. Field-line mapping and the assumption of equi-potential field lines is used to translate the locally measured ion motion to the magnetic footpoint. The mapping is used to determine the change in magnetic field line distance, which, under assumption of equipotential field lines, in turn alters the electric field at that location (E=V/d).
Cadence
PT1S
Units
m/s
ValidMin
-500
ValidMax
500
FillValue
-999.900024
Particle
ParticleType
Ion
Qualifier
Magnitude
ParticleQuantity
FlowSpeed
Parameter #29
Name
Southern Meridional Ion Velocity
ParameterKey
ICON_L27_Footpoint_Meridional_Ion_Velocity_South
Description
Velocity along local magnetic meridional direction, perpendicular to geomagnetic field and within local magnetic meridional plane, field-line mapped to southern footpoint. The meridional vector is purely vertical at the magnetic equator, positive up. Velocity obtained using ion velocities relative to co-rotation in the instrument frame along with the corresponding unit vectors expressed in the instrument frame. Field-line mapping and the assumption of equi-potential field lines is used to translate the locally measured ion motion to the magnetic footpoint. The mapping is used to determine the change in magnetic field line distance, which, under assumption of equipotential field lines, in turn alters the electric field at that location (E=V/d).
Cadence
PT1S
Units
m/s
ValidMin
-500
ValidMax
500
FillValue
-999.900024
Particle
ParticleType
Ion
Qualifier
Magnitude
ParticleQuantity
FlowSpeed
Parameter #30
Name
X-component of Northern Meridional Drift
ParameterKey
ICON_L27_Footpoint_Meridional_Vector_ECEF_X_North
Description
At the northern footpoint this is the x-component of the unit vector for meridional ion drifts expressed in the Earth-Centered, Earth-Fixed frame.
Cadence
PT1S
Units
dimensionless
ValidMin
-1
ValidMax
1
FillValue
-999.900024
Particle
ParticleType
Ion
Qualifier
Magnitude
ParticleQuantity
FlowSpeed
Parameter #31
Name
X-component of Southern Meridional Drift
ParameterKey
ICON_L27_Footpoint_Meridional_Vector_ECEF_X_South
Description
At the Southern footpoint this is the y-component of the unit vector for meridional ion drifts expressed in the Earth-Centered, Earth-Fixed frame.
Cadence
PT1S
Units
dimensionless
ValidMin
-1
ValidMax
1
FillValue
-999.900024
Particle
ParticleType
Ion
Qualifier
Magnitude
ParticleQuantity
FlowSpeed
Parameter #32
Name
Y-component of Northern Meridional Drift
ParameterKey
ICON_L27_Footpoint_Meridional_Vector_ECEF_Y_North
Description
At the northern footpoint this is the y-component of the unit vector for meridional ion drifts expressed in the Earth-Centered, Earth-Fixed frame.
Cadence
PT1S
Units
dimensionless
ValidMin
-1
ValidMax
1
FillValue
-999.900024
Particle
ParticleType
Ion
Qualifier
Magnitude
ParticleQuantity
FlowSpeed
Parameter #33
Name
Y-component of Southern Meridional Drift
ParameterKey
ICON_L27_Footpoint_Meridional_Vector_ECEF_Y_South
Description
At the Southern footpoint this is the y-component of the unit vector for meridional ion drifts expressed in the Earth-Centered, Earth-Fixed frame.
Cadence
PT1S
Units
dimensionless
ValidMin
-1
ValidMax
1
FillValue
-999.900024
Particle
ParticleType
Ion
Qualifier
Magnitude
ParticleQuantity
FlowSpeed
Parameter #34
Name
Z-component of Northern Meridional Drift
ParameterKey
ICON_L27_Footpoint_Meridional_Vector_ECEF_Z_North
Description
At the northern footpoint this is the z-component of the unit vector for meridional ion drifts expressed in the Earth-Centered, Earth-Fixed frame.
Cadence
PT1S
Units
dimensionless
ValidMin
-1
ValidMax
1
FillValue
-999.900024
Particle
ParticleType
Ion
Qualifier
Magnitude
ParticleQuantity
FlowSpeed
Parameter #35
Name
Y-component of Southern Meridional Drift
ParameterKey
ICON_L27_Footpoint_Meridional_Vector_ECEF_Z_South
Description
At the Southern footpoint this is the z-component of the unit vector for meridional ion drifts expressed in the Earth-Centered, Earth-Fixed frame.
Cadence
PT1S
Units
dimensionless
ValidMin
-1
ValidMax
1
FillValue
-999.900024
Particle
ParticleType
Ion
Qualifier
Magnitude
ParticleQuantity
FlowSpeed
Parameter #36
Name
Northern Zonal Ion Velocity
ParameterKey
ICON_L27_Footpoint_Zonal_Ion_Velocity_North
Description
Velocity along local magnetic zonal direction, perpendicular to geomagnetic field and the local magnetic meridional plane, field-line mapped to northern footpoint. The zonal vector is purely horizontal when mapped to the magnetic equator, positive is generally eastward. Velocity obtained using ion velocities relative to co-rotation in the instrument frame along with the corresponding unit vectors expressed in the instrument frame. Field-line mapping and the assumption of equi-potential field lines is used to translate the locally measured ion motion to the northern footpoint. The mapping is used to determine the change in magnetic field line distance, which, under assumption of equipotential field lines, in turn alters the electric field at that location (E=V/d).
Cadence
PT1S
Units
m/s
ValidMin
-500
ValidMax
500
FillValue
-999.900024
Particle
ParticleType
Ion
Qualifier
Magnitude
ParticleQuantity
FlowSpeed
Parameter #37
Name
Southern Zonal Ion Velocity
ParameterKey
ICON_L27_Footpoint_Zonal_Ion_Velocity_South
Description
Velocity along local magnetic zonal direction, perpendicular to geomagnetic field and the local magnetic meridional plane, field-line mapped to southern footpoint. The zonal vector is purely horizontal when mapped to the magnetic equator, positive is generally eastward. Velocity obtained using ion velocities relative to co-rotation in the instrument frame along with the corresponding unit vectors expressed in the instrument frame. Field-line mapping and the assumption of equi-potential field lines is used to translate the locally measured ion motion to the southern footpoint. The mapping is used to determine the change in magnetic field line distance, which, under assumption of equipotential field lines, in turn alters the electric field at that location (E=V/d).
Cadence
PT1S
Units
m/s
ValidMin
-500
ValidMax
500
FillValue
-999.900024
Particle
ParticleType
Ion
Qualifier
Magnitude
ParticleQuantity
FlowSpeed
Parameter #38
Name
X-component of Northern Meridional Drift
ParameterKey
ICON_L27_Footpoint_Zonal_Vector_ECEF_X_North
Description
At the northern footpoint this is the x-component of the unit vector for zonal ion drifts expressed in the Earth-Centered, Earth-Fixed frame.
Cadence
PT1S
Units
dimensionless
ValidMin
-1
ValidMax
1
FillValue
-999.900024
Particle
ParticleType
Ion
Qualifier
Magnitude
ParticleQuantity
FlowSpeed
Parameter #39
Name
X-component of Southern Meridional Drift
ParameterKey
ICON_L27_Footpoint_Zonal_Vector_ECEF_X_South
Description
At the Southern footpoint this is the x-component of the unit vector for zonal ion drifts expressed in the Earth-Centered, Earth-Fixed frame.
Cadence
PT1S
Units
dimensionless
ValidMin
-1
ValidMax
1
FillValue
-999.900024
Particle
ParticleType
Ion
Qualifier
Magnitude
ParticleQuantity
FlowSpeed
Parameter #40
Name
Y-component of Northern Meridional Drift
ParameterKey
ICON_L27_Footpoint_Zonal_Vector_ECEF_Y_North
Description
At the northern footpoint this is the y-component of the unit vector for zonal ion drifts expressed in the Earth-Centered, Earth-Fixed frame.
Cadence
PT1S
Units
dimensionless
ValidMin
-1
ValidMax
1
FillValue
-999.900024
Particle
ParticleType
Ion
Qualifier
Magnitude
ParticleQuantity
FlowSpeed
Parameter #41
Name
Y-component of Southern Meridional Drift
ParameterKey
ICON_L27_Footpoint_Zonal_Vector_ECEF_Y_South
Description
At the Southern footpoint this is the y-component of the unit vector for zonal ion drifts expressed in the Earth-Centered, Earth-Fixed frame.
Cadence
PT1S
Units
dimensionless
ValidMin
-1
ValidMax
1
FillValue
-999.900024
Particle
ParticleType
Ion
Qualifier
Magnitude
ParticleQuantity
FlowSpeed
Parameter #42
Name
Z-component of Northern Meridional Drift
ParameterKey
ICON_L27_Footpoint_Zonal_Vector_ECEF_Z_North
Description
At the northern footpoint this is the z-component of the unit vector for zonal ion drifts expressed in the Earth-Centered, Earth-Fixed frame.
Cadence
PT1S
Units
dimensionless
ValidMin
-1
ValidMax
1
FillValue
-999.900024
Particle
ParticleType
Ion
Qualifier
Magnitude
ParticleQuantity
FlowSpeed
Parameter #43
Name
Z-component of Southern Meridional Drift
ParameterKey
ICON_L27_Footpoint_Zonal_Vector_ECEF_Z_South
Description
At the Southern footpoint this is the z-component of the unit vector for zonal ion drifts expressed in the Earth-Centered, Earth-Fixed frame.
Cadence
PT1S
Units
dimensionless
ValidMin
-1
ValidMax
1
FillValue
-999.900024
Particle
ParticleType
Ion
Qualifier
Magnitude
ParticleQuantity
FlowSpeed
Parameter #44
Name
H+ Fractional Composition
ParameterKey
ICON_L27_Fractional_Ion_Density_H
Description
Determined via a non-linear least squares fit of retarding potential analyzers currents.
Cadence
PT1S
ValidMin
0
ValidMax
1
FillValue
-999.900024
Particle
ParticleType
Ion
Qualifier
Magnitude
ParticleQuantity
NumberDensity
AtomicNumber
1
Parameter #45
Name
O+ Fractional Composition
ParameterKey
ICON_L27_Fractional_Ion_Density_O
Description
Determined via a non-linear least squares fit of retarding potential analyzers currents.
Cadence
PT1S
ValidMin
0
ValidMax
1
FillValue
-999.900024
Particle
ParticleType
Ion
Qualifier
Magnitude
ParticleQuantity
NumberDensity
AtomicNumber
8
Parameter #46
Name
IVM Packet GPS Time
ParameterKey
ICON_L27_GPS_Epoch
Description
Milliseconds since 1980-01-06 00:00:00 TAI (coincident with UTC) at middle of reading. Time is generated from the time-code at byte 1015 of the IVM packet minus the time sync at byte 1019 of the IVM packet. This is the GPS time at the start of the integration period. The integration period is assumed to be 4 seconds so the center time is 2 seconds after that. The formula is (time-code * 1000ms) + 2000ms - (16 * time sync / 1000) in GPS milliseconds then converted to UTC time. See the UTD 206-024 Rev A document. Time may be delayed by up to 10 ms due to FSW polling delay. Maximum time is ~2150 UTC and minimum time is ~1970 UTC.
Cadence
PT1S
Units
ms
ValidMin
0
ValidMax
5500000000000
FillValue
-999999999999999
Support
Qualifier
Magnitude
SupportQuantity
Temporal
Parameter #47
Name
Aperture Plane Plasma Potential
ParameterKey
ICON_L27_IVM_Aperture_Potential
Description
Incident plasma will have some potential relative to the IVM aperture plane. The aperture plane voltage matches that of a conductor allowed to float electrically with respect to the spacecraft. The flux of ions (driven by s/c motion) must be balanced by the flux of electrons (driven by electron temperature). The value of the aperture plane potential evolves naturally to limit the collection of electrons such the net flux is zero.
Cadence
PT1S
Units
V
ValidMin
-5
ValidMax
20
FillValue
NaN
Field
Qualifier
Magnitude
FieldQuantity
Potential
Parameter #48
Name
Ion Density
ParameterKey
ICON_L27_Ion_Density
Description
Ion density uses measured currents and co-rotating atmosphere to determine density.
Cadence
PT1S
Units
N/cc
ValidMin
7000
ValidMax
3000000
FillValue
-999.900024
Particle
ParticleType
Ion
Qualifier
Magnitude
ParticleQuantity
NumberDensity
Parameter #49
Name
Ion Temperature
ParameterKey
ICON_L27_Ion_Temperature
Description
Temperature is obtained by assuming single temperature value for all plasma.
Cadence
PT1S
Units
K
ValidMin
0
ValidMax
4000
FillValue
NaN
Particle
ParticleType
Ion
Qualifier
Scalar
ParticleQuantity
Temperature
Parameter #50
Name
Field-Aligned Ion Velocity
ParameterKey
ICON_L27_Ion_Velocity_Field_Aligned
Description
Ion velocity relative to co-rotation along geomagnetic field lines. Positive along the main field vector. Velocity obtained using ion velocities relative to co-rotation in the instrument frame along with the corresponding unit vectors expressed in the instrument frame to express the observed vector along a geomagnetic basis.
Cadence
PT1S
Units
m/s
ValidMin
-500
ValidMax
500
FillValue
NaN
Particle
ParticleType
Ion
Qualifier
Magnitude
ParticleQuantity
FlowSpeed
Parameter #51
Name
Meridional Ion Velocity
ParameterKey
ICON_L27_Ion_Velocity_Meridional
Description
Ion velocity along local magnetic meridional direction, perpendicular to geomagnetic field and within local magnetic meridional plane. The local meridional vector maps to vertical at the magnetic equator, positive is up. Velocity obtained using ion velocities relative to co-rotation in the instrument frame along with the corresponding unit vectors expressed in the instrument frame to express the observed vector along a geomagnetic basis.
Cadence
PT1S
Units
m/s
ValidMin
-500
ValidMax
500
FillValue
NaN
Particle
ParticleType
Ion
Qualifier
Magnitude
ParticleQuantity
FlowSpeed
Parameter #52
Name
Ion Velocity along IVM-x
ParameterKey
ICON_L27_Ion_Velocity_X
Description
Velocity is relative to co-rotation. Positive-x is normal to IVM aperture plane and in the direction of satellite motion. Velocity obtained through fitting of retarding potential analyzers currents to measure the along track ion velocity. Signals produced by the motion of the spacecraft and the rotation of the Earth are removed to produce this result.
Cadence
PT1S
Units
m/s
ValidMin
-500
ValidMax
500
FillValue
NaN
Particle
ParticleType
Ion
Qualifier
Component.I
ParticleQuantity
FlowSpeed
Parameter #53
Name
Ion Velocity along IVM-y
ParameterKey
ICON_L27_Ion_Velocity_Y
Description
Velocity is relative to co-rotation. Positive-y points generally southward. Velocity obtained through conversion of arrival angles measured by the DM into a cross track velocity using trigonometry. Signals produced by the motion of the spacecraft and the rotation of the Earth are removed to produce this result.
Cadence
PT1S
Units
m/s
ValidMin
-750
ValidMax
750
FillValue
NaN
Particle
ParticleType
Ion
Qualifier
Component.J
ParticleQuantity
FlowSpeed
Parameter #54
Name
Ion Velocity along IVM-z
ParameterKey
ICON_L27_Ion_Velocity_Z
Description
Velocity is relative to co-rotation. Positive-z is directed towards nadir (Earth). Velocity obtained through conversion of arrival angles measured by the DM into a cross track velocity using trigonometry. Signals produced by the motion of the spacecraft and the rotation of the Earth are removed to produce this result.
Cadence
PT1S
Units
m/s
ValidMin
-750
ValidMax
750
FillValue
NaN
Particle
ParticleType
Ion
Qualifier
Component.K
ParticleQuantity
FlowSpeed
Parameter #55
Name
Zonal Ion Velocity
ParameterKey
ICON_L27_Ion_Velocity_Zonal
Description
Ion velocity relative to co-rotation along the magnetic zonal direction, normal to local magnetic meridional plane and the geomagnetic field (positive east). The local zonal vector maps to purely horizontal at the magnetic equator. Velocity obtained using ion velocities relative to co-rotation in the instrument frame along with the corresponding unit vectors expressed in the instrument frame to express the observed vector along a geomagnetic basis.
Cadence
PT1S
Units
m/s
ValidMin
-500
ValidMax
500
FillValue
NaN
Particle
ParticleType
Ion
Qualifier
Magnitude
ParticleQuantity
FlowSpeed
Parameter #56
Name
WGS84 Latitude of Spacecraft position (geodetic)
ParameterKey
ICON_L27_Latitude
Description
WGS84 Latitude of spacecraft position (geodetic).
Cadence
PT30S
Units
deg
ValidMin
-90
ValidMax
90
FillValue
-999.900024
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #57
Name
WGS84 Longitude of Spacecraft position (geodetic)
ParameterKey
ICON_L27_Longitude
Description
Geodetic Longitude of Spacecraft in WGS84.
Cadence
PT30S
Units
deg
ValidMin
0
ValidMax
360
FillValue
-999.900024
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #58
Name
MTB Status [ON/OFF]
ParameterKey
ICON_L27_MTB_Status
Description
If the MTB are active during any part of the measurement, it is recorded as active for whole measurement. Decoded from s/c housekeeping file: /disks/icondata/Temporary/ICON.SDC.Pipeline.IVM.Ancillary.2020-03-13T161524.20CD292B-2A3B-4142-86C9-5D73B55AFDCE/Input/ICON_L0_Spacecraft_Housekeeping-MTB_2019-11-01_v01r010.CSV If the MTB are active during any part of the measurement, it is recorded as active for whole measurement. Decoded from s/c housekeeping file.
Cadence
PT1S
ValidMin
0
ValidMax
10
FillValue
255
Support
Qualifier
Scalar
SupportQuantity
InstrumentMode
Parameter #59
Name
Magnetic Latitude of Spacecraft Position
ParameterKey
ICON_L27_Magnetic_Latitude
Description
Quasi-dipole magnetic latitude for spacecraft position.
Cadence
PT30S
Units
deg
ValidMin
-90
ValidMax
90
FillValue
-999.900024
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #60
Name
Magnetic Local Time at spacecraft
ParameterKey
ICON_L27_Magnetic_Local_Time
Description
Magnetic Local Time at spacecraft.
Cadence
PT30S
Units
hour
ValidMin
0
ValidMax
24
FillValue
-999.900024
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #61
Name
Magnetic Longitude of Spacecraft Position
ParameterKey
ICON_L27_Magnetic_Longitude
Description
Quasi-dipole magnetic longitude for spacecraft position.
Cadence
PT30S
Units
deg
ValidMin
0
ValidMax
360
FillValue
-999.900024
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #62
Name
Earth Corotation Velocity in the X component
ParameterKey
ICON_L27_Observatory_Corotation_X
Description
Earth Centered Inertial Earth Corotation Velocity Component of Earth's corotation velocity in the IVM instrament axes. [(X,Y,Z),Epoch].
Cadence
PT1S
Units
m/s
ValidMin
-1000
ValidMax
1000
FillValue
-999.900024
Support
Qualifier
Component.I
SupportQuantity
Other
Parameter #63
Name
Earth Corotation Velocity in the Y compnent
ParameterKey
ICON_L27_Observatory_Corotation_Y
Description
Earth Centered Inertial Earth Corotation Velocity Component of Earth's corotation velocity in the IVM instrament axes. [(X,Y,Z),Epoch].
Cadence
PT1S
Units
m/s
ValidMin
-1000
ValidMax
1000
FillValue
-999.900024
Support
Qualifier
Component.J
SupportQuantity
Other
Parameter #64
Name
Earth Corotation Velocity in the Z compnent
ParameterKey
ICON_L27_Observatory_Corotation_Z
Description
Earth Centered Inertial Earth Corotation Velocity Component of Earth's corotation velocity in the IVM instrament axes. [(X,Y,Z),Epoch].
Cadence
PT1S
Units
m/s
ValidMin
-1000
ValidMax
1000
FillValue
-999.900024
Support
Qualifier
Component.J
SupportQuantity
Other
Parameter #65
Name
X Component of the Magnetic Field
ParameterKey
ICON_L27_Observatory_Magnetic_Field_X
Description
Magnetic field from IGRF at v position, expressed in the Earth-Centered, Earth-Fixed frame. x - component
Cadence
PT1S
Units
nT
ValidMin
-60000
ValidMax
60000
FillValue
-999.900024
Field
Qualifier
Component.I
FieldQuantity
Magnetic
Parameter #66
Name
Y Component of the Magnetic Field
ParameterKey
ICON_L27_Observatory_Magnetic_Field_Y
Description
Magnetic field from IGRF at spacecraft position, expressed in the Earth-Centered, Earth-Fixed frame. y - component
Cadence
PT1S
Units
nT
ValidMin
-60000
ValidMax
60000
FillValue
-999.900024
Field
Qualifier
Component.J
FieldQuantity
Magnetic
Parameter #67
Name
Z Component of the Magnetic Field
ParameterKey
ICON_L27_Observatory_Magnetic_Field_Z
Description
Magnetic field from IGRF at spacecraft position, expressed in the Earth-Centered, Earth-Fixed frame. z - component
Cadence
PT1S
Units
nT
ValidMin
-60000
ValidMax
60000
FillValue
-999.900024
Field
Qualifier
Component.K
FieldQuantity
Magnetic
Parameter #68
Name
Earth Centered Inertial Spacecraft Velocity X Component
ParameterKey
ICON_L27_Observatory_Velocity_X
Description
Velocity of spacecraft in Earth Centered Inertial, J2000, cooridinates. Array is set up as [(X,Y,Z),Epoch]
Cadence
PT1S
Units
m/s
ValidMin
-1000
ValidMax
1000
FillValue
-999.900024
Support
Qualifier
Component.I
SupportQuantity
Other
Parameter #69
Name
Earth Centered Inertial Spacecraft Velocity Y Component
ParameterKey
ICON_L27_Observatory_Velocity_Y
Description
Velocity of spacecraft in Earth Centered Inertial, J2000, cooridinates. Array is set up as [(X,Y,Z),Epoch]
Cadence
PT1S
Units
m/s
ValidMin
-1000
ValidMax
1000
FillValue
-999.900024
Support
Qualifier
Component.J
SupportQuantity
Other
Parameter #70
Name
Earth Centered Inertial Spacecraft Velocity Z Component
ParameterKey
ICON_L27_Observatory_Velocity_Z
Description
Velocity of spacecraft in Earth Centered Inertial, J2000, cooridinates. Array is set up as [(X,Y,Z),Epoch]
Cadence
PT1S
Units
m/s
ValidMin
-1000
ValidMax
1000
FillValue
-999.900024
Support
Qualifier
Component.K
SupportQuantity
Other
Parameter #71
Name
Orbit Number
ParameterKey
ICON_L27_Orbit_Number
Description
Orbit Number
Cadence
PT1S
ValidMin
0
ValidMax
105000
FillValue
-999.000000
Support
Qualifier
Scalar
SupportQuantity
Temporal
Parameter #72
Name
Flag for Retarding Potential Analyzers quality
ParameterKey
ICON_L27_RPA_Flag
Description
Status flag for retarding potential analyzers. 0 - All retarding potential analyzers parameters are good. Ion temperatures correspond to both O+ and H+. 1 - Ram Ion Velocities are not good. Other parameters good. Plasma is presumed to be co-rotating when fitting retarding potential analyzers curves that have an insufficient quantity of O+. Ion temperatures correspond to H+ only. 2 - Geophysical outputs may be impacted by spacecraft operations..
Cadence
PT30S
ValidMin
0
ValidMax
3
FillValue
-9223372036854775808
Support
Qualifier
Scalar
SupportQuantity
DataQuality
Parameter #73
Name
Ion Velocity-X
ParameterKey
ICON_L27_Raw_Ion_Velocity_X
Description
This is the total ion velocity along direction into the retarding potential analyzers, including spacecraft motion.
Cadence
PT1S
Units
m/s
ValidMin
6000
ValidMax
9000
FillValue
NaN
Particle
ParticleType
Ion
Qualifier
Component.I
ParticleQuantity
FlowSpeed
Parameter #74
Name
Ion Velocity-Y
ParameterKey
ICON_L27_Raw_Ion_Velocity_Y
Description
This is the total ion velocity along direction into the retarding potential analyzers, including spacecraft motion.
Cadence
PT1S
Units
m/s
ValidMin
-1500.000000
ValidMax
1500.000000
FillValue
NaN
Particle
ParticleType
Ion
Qualifier
Component.J
ParticleQuantity
FlowSpeed
Parameter #75
Name
Ion Velocity-Z
ParameterKey
ICON_L27_Raw_Ion_Velocity_Z
Description
This is the total ion velocity along direction into the retarding potential analyzers, including spacecraft motion.
Cadence
PT1S
Units
m/s
ValidMin
-1500.000000
ValidMax
1500.000000
FillValue
NaN
Particle
ParticleType
Ion
Qualifier
Component.K
ParticleQuantity
FlowSpeed
Parameter #76
Name
Slew Status
ParameterKey
ICON_L27_Slew_Status
Description
Slew Status.
Cadence
PT1S
ValidMin
NaN
ValidMax
NaN
FillValue
NaN
Support
Qualifier
Scalar
SupportQuantity
Other
Parameter #77
Name
Local Solar Time
ParameterKey
ICON_L27_Solar_Local_Time
Description
Local Solar Time at the spacecraft.
Cadence
PT30S
Units
hour
ValidMin
0
ValidMax
24
FillValue
-999.900024
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #78
Name
Solar Zenith Angleof the Spacecraft
ParameterKey
ICON_L27_Solar_Zenith_Angle
Description
Solar Zenith Angle of spacecraft.
Cadence
PT30S
Units
degrees
ValidMin
0
ValidMax
180
FillValue
9.969209968386869e+36
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #79
Name
Space Environment Region Status
ParameterKey
ICON_L27_Space_Environment_Region_Status
Description
Standarized for several missions, not all codes are relevant. Binary Coded Integer from Technical Note ICN-TN-027. 1: Earth Shadow 2: Lunar Shadow 4: Atmospheric Absorption Zone 8: South Atlantic Anomaly 16: Northern Auroral Zone 32: Southern Auroral Zone 64: Periapsis Passage 128: Inner and Outer Radiation Belts 256: Deep Plasma Sphere 512: Foreshock Solar Wind 1024: Solar Wind Beam 2048: High Magnetic Field 4096: Average Plasma Sheet 8192: Bowshock Crossing 16384: Magnetopause Crossing 32768: Ground Based Observatories 65536: 2-Day Conjunctions 131072: 4-Day Conjunctions 262144: Time Based Conjunctions 524288: Radial Distance Region 1 1048576: Orbit Outbound 2097152: Orbit Inbound 4194304: Lunar Wake 8388608: Magnetotail 16777216: Magnetosheath 33554432: Science 67108864: Low Magnetic Latitude 134217728: Conjugate Observation.
Cadence
PT1S
Units
binary
ValidMin
0
ValidMax
268405455
FillValue
-999.000000
Support
Qualifier
Scalar
SupportQuantity
Other
Parameter #80
Name
Spacecraft Sun/Shadow Status Code
ParameterKey
ICON_L27_Sun_Status
Description
Spacecraft Sun/Shadow Status Code.
Cadence
PT1S
Units
binary
ValidMin
0
ValidMax
1
FillValue
-999.000000
Support
Qualifier
Scalar
SupportQuantity
Other
Parameter #81
Name
IVM Packet Beginning UTC Time
ParameterKey
ICON_L27_Time_UTC_Start
Description
Milliseconds since 1970-01-01 00:00:00 UTC at start of reading. Time is generated from the time-code at byte 1015 of the IVM packet minus the time sync at byte 1019 of the IVM packet. This is the GPS time at the start of the integration period. The integration period is assumed to be 4 seconds so the center time is 2 seconds after that. The formula is (time-code * 1000ms) + 2000ms - (16 * time sync / 1000) in GPS milliseconds then converted to UTC time. See the UTD 206-024 Rev A document. Time may be delayed by up to 10 ms due to FSW polling delay. Maximum time is ~2150 UTC and minimum time is ~1970 UTC.
Cadence
PT1S
Units
milliseconds
ValidMin
0
ValidMax
6000000000000
FillValue
-999999999999999
Support
Qualifier
Magnitude
SupportQuantity
Temporal
Parameter #82
Name
IVM Packet Ending UTC Time
ParameterKey
ICON_L27_Time_UTC_Stop
Description
Milliseconds since 1970-01-01 00:00:00 UTC at end of reading. Time is generated from the time-code at byte 1015 of the IVM packet minus the time sync at byte 1019 of the IVM packet. This is the GPS time at the start of the integration period. The integration period is assumed to be 4 seconds so the center time is 2 seconds after that. The formula is (time-code * 1000ms) + 2000ms - (16 * time sync / 1000) in GPS milliseconds then converted to UTC time. See the UTD 206-024 Rev A document. Time may be delayed by up to 10 ms due to FSW polling delay. Maximum time is ~2150 UTC and minimum time is ~1970 UTC.
Cadence
PT1S
Units
milliseconds
ValidMin
0
ValidMax
6000000000000
FillValue
-999999999999999
Support
Qualifier
Magnitude
SupportQuantity
Temporal
Parameter #83
Name
UTC Time
ParameterKey
ICON_L27_UTC_Time
Description
ISO 9601 formatted UTC timestamp (at middle of reading). Time is generated from the time-code at byte 1015 of the IVM packet minus the time sync at byte 1019 of the IVM packet. This is the GPS time at the start of the integration period. The integration period is assumed to be 4 seconds so the center time is 2 seconds after that. The formula is (time-code * 1000ms) + 2000ms - (16 * time sync / 1000) in GPS milliseconds then converted to UTC time. See the UTD 206-024 Rev A document. Time may be delayed by up to 10 ms due to FSW polling delay. Maximum time is ~2150 UTC and minimum time is ~1970 UTC.
Cadence
PT1S
ValidMin
1970-01-01 00:00:00 UTC
ValidMax
2150-01-01 00:00:00 UTC
Support
Qualifier
Magnitude
SupportQuantity
Temporal
Parameter #84
Name
Field Aligned Unit Vector: IVM-X component
ParameterKey
ICON_L27_Unit_Vector_Field_Aligned_X
Description
Positive along the field, generally northward. Unit vector is along the geomagnetic field. The unit vector is expressed in the IVM coordinate system, x - along RAM, z - towards nadir, y - completes the system, generally southward. Calculated using the corresponding unit vector in Earth-Centered, Earth-Fixed and the orientation of the IVM also expressed in Earth-Centered, Earth-Fixed (sc_*hat_*).
Cadence
PT1S
ValidMin
-1
ValidMax
1
FillValue
NaN
Particle
ParticleType
Ion
Qualifier
Component.I
ParticleQuantity
FlowSpeed
Parameter #85
Name
Field Aligned Unit Vector: IVM-Y component
ParameterKey
ICON_L27_Unit_Vector_Field_Aligned_Y
Description
Positive along the field, generally northward. Unit vector is along the geomagnetic field. The unit vector is expressed in the IVM coordinate system, x - along RAM, z - towards nadir, y - completes the system, generally southward. Calculated using the corresponding unit vector in Earth-Centered, Earth-Fixed and the orientation of the IVM also expressed in Earth-Centered, Earth-Fixed (sc_*hat_*).
Cadence
PT1S
ValidMin
-1
ValidMax
1
FillValue
NaN
Particle
ParticleType
Ion
Qualifier
Component.J
ParticleQuantity
FlowSpeed
Parameter #86
Name
Field Aligned Unit Vector: IVM-Z component
ParameterKey
ICON_L27_Unit_Vector_Field_Aligned_Z
Description
Positive along the field, generally northward. Unit vector is along the geomagnetic field. The unit vector is expressed in the IVM coordinate system, x - along RAM, z - towards nadir, y - completes the system, generally southward. Calculated using the corresponding unit vector in Earth-Centered, Earth-Fixed and the orientation of the IVM also expressed in Earth-Centered, Earth-Fixed (sc_*hat_*).
Cadence
PT1S
ValidMin
-1
ValidMax
1
FillValue
NaN
Particle
ParticleType
Ion
Qualifier
Component.K
ParticleQuantity
FlowSpeed
Parameter #87
Name
Meridional Unit Vector: IVM-X component
ParameterKey
ICON_L27_Unit_Vector_Meridional_X
Description
Positive is aligned with vertical at geomagnetic equator. Unit vector is perpendicular to the geomagnetic field and in the plane of the meridian.The unit vector is expressed in the IVM coordinate system, x - along RAM, z - towards nadir, y - completes the system, generally southward. Calculated using the corresponding unit vector in Earth-Centered, Earth-Fixed and the orientation of the IVM also expressed in Earth-Centered, Earth-Fixed (sc_*hat_*).
Cadence
PT1S
ValidMin
-1
ValidMax
1
FillValue
NaN
Particle
ParticleType
Ion
Qualifier
Component.I
ParticleQuantity
FlowSpeed
Parameter #88
Name
Meridional Unit Vector: IVM-Y component
ParameterKey
ICON_L27_Unit_Vector_Meridional_Y
Description
Positive is aligned with vertical at geomagnetic equator. Unit vector is perpendicular to the geomagnetic field and in the plane of the meridian.The unit vector is expressed in the IVM coordinate system, x - along RAM, z - towards nadir, y - completes the system, generally southward. Calculated using the corresponding unit vector in Earth-Centered, Earth-Fixed and the orientation of the IVM also expressed in Earth-Centered, Earth-Fixed (sc_*hat_*).
Cadence
PT1S
ValidMin
-1
ValidMax
1
FillValue
NaN
Particle
ParticleType
Ion
Qualifier
Component.J
ParticleQuantity
FlowSpeed
Parameter #89
Name
Meridional Unit Vector: IVM-Z component
ParameterKey
ICON_L27_Unit_Vector_Meridional_Z
Description
Positive is aligned with vertical at geomagnetic equator. Unit vector is perpendicular to the geomagnetic field and in the plane of the meridian.The unit vector is expressed in the IVM coordinate system, x - along RAM, z - towards nadir, y - completes the system, generally southward. Calculated using the corresponding unit vector in Earth-Centered, Earth-Fixed and the orientation of the IVM also expressed in Earth-Centered, Earth-Fixed (sc_*hat_*).
Cadence
PT1S
ValidMin
-1
ValidMax
1
FillValue
NaN
Particle
ParticleType
Ion
Qualifier
Component.K
ParticleQuantity
FlowSpeed
Parameter #90
Name
Zonal Unit Vector: IVM-X component
ParameterKey
ICON_L27_Unit_Vector_Zonal_X
Description
Positive towards the east. Zonal vector is normal to magnetic meridian plane. The unit vector is expressed in the IVM coordinate system, x - along RAM, z - towards nadir, y - completes the system, generally southward. Calculated using the corresponding unit vector in Earth-Centered, Earth-Fixed and the orientation of the IVM also expressed in Earth-Centered, Earth-Fixed (sc_*hat_*).
Cadence
PT1S
ValidMin
-1
ValidMax
1
FillValue
NaN
Particle
ParticleType
Ion
Qualifier
Component.I
ParticleQuantity
FlowSpeed
Parameter #91
Name
Zonal Unit Vector: IVM-Y component
ParameterKey
ICON_L27_Unit_Vector_Zonal_Y
Description
Positive towards the east. Zonal vector is normal to magnetic meridian plane. The unit vector is expressed in the IVM coordinate system, x - along RAM, z - towards nadir, y - completes the system, generally southward. Calculated using the corresponding unit vector in Earth-Centered, Earth-Fixed and the orientation of the IVM also expressed in Earth-Centered, Earth-Fixed (sc_*hat_*).
Cadence
PT1S
ValidMin
-1
ValidMax
1
FillValue
NaN
Particle
ParticleType
Ion
Qualifier
Component.J
ParticleQuantity
FlowSpeed
Parameter #92
Name
Zonal Unit Vector: IVM-Z component
ParameterKey
ICON_L27_Unit_Vector_Zonal_Z
Description
Positive towards the east. Zonal vector is normal to magnetic meridian plane. The unit vector is expressed in the IVM coordinate system, x - along RAM, z - towards nadir, y - completes the system, generally southward. Calculated using the corresponding unit vector in Earth-Centered, Earth-Fixed and the orientation of the IVM also expressed in Earth-Centered, Earth-Fixed (sc_*hat_*).
Cadence
PT1S
ValidMin
-1
ValidMax
1
FillValue
NaN
Particle
ParticleType
Ion
Qualifier
Component.K
ParticleQuantity
FlowSpeed
NASA Insignia
Contact SPDF: NASA-SPDF Feedback/Support
Responsible NASA Official: Lan Jian
Site Editor: Rita Johnson
SPDF ROR ID
SPDF re3data ID
About NASA
Accessibility
FOIA
No FEAR Act
Privacy Policy
Vulnerability Disclosure Policy
Last Updated: 2023-08-01