HDPWS

ICON The Far Ultra Violet Imaging Spectrograph Day Limb Images

(2024). ICON The Far Ultra Violet Imaging Spectrograph Day Limb Images [Data set]. NASA Space Physics Data Facility. https://doi.org/10.48322/BWJZ-NK36 (CiteAs link). Accessed on .

ResourceID
spase://NASA/NumericalData/ICON/FUV/L2/Limb/PT12S

Description
The FUV instrument takes 2D images of the Earth’s horizon in the Far ultraviolet. The imager is pointing approximately 90 degrees to the spacecraft motion, similar to looking out of the side window of a car as it drives down the road. Onboard electronics read the CCD detectors 8 times per second and collect the data into radiance profiles every 12 seconds. The calibrated level 1 radiances and Level 1 ancillary spacecraft data are combined in a limb retrieval to produce the level 2.4 O/N2 limb product.

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NumericalData

ResourceID
spase://NASA/NumericalData/ICON/FUV/L2/Limb/PT12S
ResourceHeader
ResourceName
ICON The Far Ultra Violet Imaging Spectrograph Day Limb Images
AlternateName
FUV Day Limb Images
DOI
https://doi.org/10.48322/BWJZ-NK36
ReleaseDate
2024-06-05 00:00:00Z
RevisionHistory
RevisionEvent
ReleaseDate
2024-05-08 00:00:00Z
Note
Created NumericalData Metadata. JMW.
RevisionEvent
ReleaseDate
2024-06-05 00:00:00Z
Note
Added DOI. Edited metadata at PIs request. JMW.
Description
The FUV instrument takes 2D images of the Earth’s horizon in the Far ultraviolet. The imager is pointing approximately 90 degrees to the spacecraft motion, similar to looking out of the side window of a car as it drives down the road. Onboard electronics read the CCD detectors 8 times per second and collect the data into radiance profiles every 12 seconds. The calibrated level 1 radiances and Level 1 ancillary spacecraft data are combined in a limb retrieval to produce the level 2.4 O/N2 limb product.
Acknowledgement
National Aeronautics and Space Administration; Dr. Andrew W. Stephan; Dr. Thomas Immel
PublicationInfo
Authors
Stephan, A. W., R.R. Meier, S.L. England, S.B. Mende, H.U. Frey, T.J. Immel
PublicationDate
2024-06-05 00:00:00
PublishedBy
NASA Space Physics Data Facility
Funding
Agency
National Aeronautics and Space Administration
Project
Explorers Program
AwardNumber
contracts NNG12FA45C
Contacts
Role Person StartDate StopDate Note
1. PrincipalInvestigator spase://SMWG/Person/Andrew.W.Stephan
InformationURL
Name
Additional information on ICON
URL
Description
ICON Project Homepage.
InformationURL
Name
The far ultra-violet Imager on the ICON mission
URL
Description
Space Science Reviews, 212(1-2), pp.655-696. DOI: 10.1007/s11214-017-0386-0
InformationURL
Name
Daytime O/N2 Retrieval Algorithm for the Ionospheric Connection Explorer (ICON)
URL
Description
Space Science Reviews, 212(1-2), pp.655-696. DOI: 10.1007/s11214-017-0386-0
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
CDAWeb HAPI Server
URL
Style
HAPI
ProductKey
ICON_L2-4_FUV_DAY-LIMB
Description
Web Service to this product using the HAPI interface.
Format
NetCDF
Acknowledgement
Please acknowledge Andrew W. Stephan and Robert R. Meier. Please acknowledge the Data Providers and CDAWeb when using these Data.
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
HTTPS from SPDF
URL
ProductKey
ICON_L2-4_FUV_DAY-LIMB
Description
Access to Data in NetCDF Format via https from SPDF
AccessURL
Name
CDAWeb
URL
ProductKey
ICON_L2-4_FUV_DAY-LIMB
Description
Access to NetCDFs via NASA/GSFC CDAWeb
Format
NetCDF
Encoding
None
AccessDirectoryTemplate
https://cdaweb.gsfc.nasa.gov/pub/data/icon/l2/l2-4_fuv_day-limb/$Y
AccessFilenameTemplate
icon_l2-4_fuv_day-limb_$Y$m$d_v06r000.nc
Acknowledgement
Please acknowledge Andrew W. Stephan and Robert R. Meier. Please acknowledge the Data Providers and CDAWeb when using these Data.
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
CDAWeb Programmatic Data Access
URL
Style
WebService
ProductKey
ICON_L2-4_FUV_DAY-LIMB
Description
Access to this data from common programming environments. Note: this AccessInformation element was added by HDPWS.
Format
Binary
Acknowledgement
Please acknowledge Andrew W. Stephan and Robert R. Meier. Please acknowledge the Data Providers and CDAWeb when using these Data.
ProcessingLevel
Calibrated
ProviderName
ICON FUV team
InstrumentIDs
MeasurementType
ImageIntensity
TemporalDescription
TimeSpan
StartDate
2019-12-06 00:00:00Z
StopDate
2024-11-24 23:59:59Z
Cadence
PT12S
ObservedRegion
Earth.NearSurface.Atmosphere
ObservedRegion
Earth.NearSurface.Ionosphere
Parameter #1
Name
Epoch Time
ParameterKey
Epoch
Description
Time corresponding to the center of each observation, in milliseconds since Jan 1 1970.
Cadence
PT12S
Units
ms
ValidMin
0
ValidMax
6000000000000
FillValue
-999
Support
Qualifier
Magnitude
SupportQuantity
Temporal
Parameter #2
Name
Altitude Grid Used by the Retrieval
ParameterKey
ICON_L24_Altitude
Description
Altitude grid used by the retrieval, in WGS, as a function of time.
Cadence
PT12S
Units
km
ValidMin
-600
ValidMax
600
FillValue
-999
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #3
Name
Ap Index
ParameterKey
ICON_L24_Ap
Description
Value of Ap used in the forward model, as a function of time. These data are from http://www-app3.gfz-potsdam.de/kp_index/. These are the tabulated Kp values from GFZ German Research Centre for Geosciences at the Helmholtz Centre Potsdam.
Cadence
PT12S
ValidMin
0
ValidMax
400
FillValue
-999
Field
Qualifier
Scalar
FieldQuantity
Magnetic
Parameter #4
Name
Retrieved Disk Column O/N2
ParameterKey
ICON_L24_Column_O_N2
Description
Retrieved column O/N2 from the limb data, as a function of time.
Cadence
PT12S
Units
Dimensionless
ValidMin
0
ValidMax
45
FillValue
-999
Mixed
MixedQuantity
Other
Qualifier
Ratio
Parameter #5
Name
F10.7 Used in Inversion Process
ParameterKey
ICON_L24_F107
Description
Unscaled value of F10.7 used as an input to the inversion process, as a function of time. These data are from ftp://ftp.seismo.nrcan.gc.ca/spaceweather/solar_flux/fluxtable.txt. These are the solar radio flux values tabulated from the Space Weather Canada which is a part of Natural Resources Canada.
Cadence
PT12S
Units
sfu
ValidMin
0
ValidMax
500
FillValue
-999
Wave
WaveType
Photon
Qualifier
Scalar
WaveQuantity
EnergyFlux
Parameter #6
Name
Tangent Altitudes of Input Data
ParameterKey
ICON_L24_Input_Altitude
Description
Tangent altitudes of input data, in km above the WGS-84 geoid, as functions of time.
Cadence
PT12S
Units
km
ValidMin
-1000
ValidMax
1000
FillValue
-999
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #7
Name
Corrected Input Data for the Long Wave Channel
ParameterKey
ICON_L24_Input_Corrected_LW_L1_Radiance
Description
Corrected input data for the long wave channel, in Rayleighs, as functions of tangent altitude and time.
Cadence
PT12S
Units
Rayleighs
ValidMin
-1000
ValidMax
1000
FillValue
-999
Wave
WaveType
Photon
WaveQuantity
Intensity
Parameter #8
Name
Corrected input data for the Short Wave Channel
ParameterKey
ICON_L24_Input_Corrected_SW_L1_Radiance
Description
Corrected input data for the short wave channel, in Rayleighs, as functions of tangent altitude and time.
Cadence
PT12S
Units
Rayleighs
ValidMin
-1000
ValidMax
1000
FillValue
-999
Wave
WaveType
Photon
WaveQuantity
Intensity
Parameter #9
Name
Line of Sight Azimuth Angles
ParameterKey
ICON_L24_Input_Look_Azimuth_Angle
Description
Line of sight azimuth angles, in degrees, as functions tangent altitude of time.
Cadence
PT12S
Units
degrees
ValidMin
-360
ValidMax
360
FillValue
-999
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #10
Name
Line of Sight Zenith Angles
ParameterKey
ICON_L24_Input_Look_Zenith_Angle
Description
Line of sight zenith angles, in degrees, as functions tangent altitdue of time.
Cadence
PT12S
Units
degrees
ValidMin
0
ValidMax
180
FillValue
-999
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #11
Name
Uncorrected Input Data for the Long Wave Channel
ParameterKey
ICON_L24_Input_Uncorrected_LW_L1_Radiance
Description
Uncorrected input data for the long wave channel, in Rayleighs, as functions of tangent altitude and time.
Cadence
PT12S
Units
Rayleighs
ValidMin
-1000
ValidMax
1000
FillValue
-999
Wave
WaveType
Photon
WaveQuantity
Intensity
Parameter #12
Name
Uncorrected Input Data for the Short Wave Channel
ParameterKey
ICON_L24_Input_Uncorrected_SW_L1_Radiance
Description
Uncorrected input data for the short wave channel, in Rayleighs, as functions of tangent altitude and time.
Cadence
PT12S
Units
Rayleighs
ValidMin
-1000
ValidMax
1000
FillValue
-999
Wave
WaveType
Photon
WaveQuantity
Intensity
Parameter #13
Name
Data Collection Mode
ParameterKey
ICON_L24_Instrument_Mode_Flag
Description
Data collection mode of FUV instrument 1 = Dayside science 2 = Nightside science 3 = Calibration 4 = Nadir 5 = Conjugate 6 = Stars 7 = Ram 8 = Off Target 9 = Engineering 13 = Unknown.
Cadence
PT12S
ValidMin
0
ValidMax
127
FillValue
127
Support
Qualifier
Scalar
SupportQuantity
InstrumentMode
Parameter #14
Name
Number of Iteration Steps
ParameterKey
ICON_L24_Iteration_Steps
Description
*Diagnostic* Number of iteration steps performed before model converged on answer, as a function of time.
Cadence
PT12S
ValidMin
0
ValidMax
45
FillValue
-999
Support
Qualifier
Total
SupportQuantity
Other
Parameter #15
Name
Latitude of the Retrieval
ParameterKey
ICON_L24_Latitude
Description
Latitude of the retrieval, defined at 150 km tangent altitude, in WGS.
Cadence
PT12S
Units
degrees
ValidMin
-90
ValidMax
90
FillValue
-999
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #16
Name
Quality Flag of Data Quality
ParameterKey
ICON_L24_Level_1_Quality_Flag
Description
QUALITY_FLAG is an indicator of data quality = 0 = No errors or quality conditions, LVLH 1 = No errors or quality conditions, R-LVLH 2 = Lunar calibration 3 = Insufficient high voltage 4 = Nadir calibration 5 = Zero wind calibration 6 = Bad pointing 7 = S/C attitude slew 8 = Conjugate observation 9 = Stellar calibration 10 = Unreliable background subtracted 17 = unspecified error condition.
Cadence
PT12S
ValidMin
0
ValidMax
127
FillValue
127
Support
Qualifier
Uncertainty
SupportQuantity
DataQuality
Parameter #17
Name
Limb Retrieval Quality Flag
ParameterKey
ICON_L24_Limb_Retrieval_Flags
Description
Limb retrieval quality flag, where 0 = no limb inversion, 1 = retrieval nominal, 2 = number of iterations in retrieval algorithm reaches 10 without convergence, 3 = one or more inversion model parameters hits a priori upper or lower limit, 4 = altitude of peak intensity too close to boundary, 5 = standard deviation of one or more variables exceeds expected limit, 6 = Chi-squared value is outside of expected range - either too large or too small, 7 = one or more uncertainties is outside of expected range.
Cadence
PT12S
ValidMin
0
ValidMax
10
FillValue
-999
Support
Qualifier
Scalar
SupportQuantity
DataQuality
Parameter #18
Name
Local Solar Time of the Retrieval
ParameterKey
ICON_L24_Local_Solar_Time
Description
Local solar time of the retrieval, defined at 150 km tangent altitude, in WGS.
Cadence
PT12S
Units
hours
ValidMin
0
ValidMax
24
FillValue
-999
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #19
Name
Longitude of the Retrieval
ParameterKey
ICON_L24_Longitude
Description
Longitude of the retrieval, defined at 150 km tangent altitude, in WGS.
Cadence
PT12S
Units
degrees
ValidMin
0
ValidMax
360
FillValue
-999
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #20
Name
Model Error Flag
ParameterKey
ICON_L24_Model_Flags
Description
*Diagnostic* flag = 0 - nominal, flag(0)= 1 - 20 steps reached without converging, flag(1)=1 model para hit upper or lower limit, flag(2)=1 peak alt is too close to boundary.
Cadence
PT12S
ValidMin
0
ValidMax
45
FillValue
-999
Support
Qualifier
Scalar
SupportQuantity
DataQuality
Parameter #21
Name
Retrieved Altitude Profile of Nitrogen Molecules
ParameterKey
ICON_L24_N2
Description
Retrieved altitude profile of N2 from the retrieval, in cm-3, as a function of altitude and time.
Cadence
PT12S
Units
cm-3
ValidMin
0
ValidMax
100000002004087734272
FillValue
-999
Particle
ParticleType
Molecule
Qualifier
LineOfSight
ParticleQuantity
NumberDensity
AtomicNumber
14
Parameter #22
Name
Retrieved Altitude Profile of Oxygen
ParameterKey
ICON_L24_O
Description
Retrieved altitude profile of oxygen from the retrieval, in cm-3, as a function of altitude and time.
Cadence
PT12S
Units
cm-3
ValidMin
0
ValidMax
100000002004087734272
FillValue
-999
Particle
ParticleType
Molecule
Qualifier
LineOfSight
ParticleQuantity
NumberDensity
AtomicNumber
8
Parameter #23
Name
Retrieved Altitude Profile of Oxygen Molecules
ParameterKey
ICON_L24_O2
Description
Retrieved altitude profile of O2 from the retrieval, in cm-3, as a function of altitude and time.
Cadence
PT12S
Units
cm-3
ValidMin
0
ValidMax
100000002004087734272
FillValue
-999
Particle
ParticleType
Molecule
Qualifier
LineOfSight
ParticleQuantity
NumberDensity
AtomicNumber
16
Parameter #24
Name
Geodetic Altitude (WGS84) of the Spacecraft
ParameterKey
ICON_L24_Observatory_Altitude
Description
Geodetic altitude (WGS84) of the spacecraft at the time corresponding to the middle of each FUV image, in kilometers.
Cadence
PT12S
Units
km
ValidMin
-600
ValidMax
600
FillValue
-999
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #25
Name
ICON Spacecraft WGS84 Latitude
ParameterKey
ICON_L24_Observatory_Latitude
Description
Geodetic latitude (WGS84) of the spacecraft at the time corresponding to the middle of each FUV image, in degrees.
Cadence
PT12S
Units
degrees
ValidMin
-90
ValidMax
90
FillValue
-999
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #26
Name
ICON Spacecraft WGS84 Longitude
ParameterKey
ICON_L24_Observatory_Longitude
Description
Geodetic longitude (WGS84) of the spacecraft at the time corresponding to the middle of each FUV image, in degrees.
Cadence
PT12S
Units
degrees
ValidMin
0
ValidMax
360
FillValue
-999
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #27
Name
Predicted Initial Column O/N2
ParameterKey
ICON_L24_Predicted_Column_O_N2
Description
*Diagnostic* Initial column O/N2 used by the limb retrieval, as a function of time.
Cadence
PT12S
Units
Dimensionless
ValidMin
0
ValidMax
45
FillValue
-999
Mixed
MixedQuantity
Other
Qualifier
Ratio
Parameter #28
Name
Initial Predicted Altitude Profile of Nitrogen Molecules
ParameterKey
ICON_L24_Predicted_N2
Description
*Diagnostic* Initial altitude profile of N2 used by the retrieval, in cm-3, as a function of altitude and time.
Cadence
PT12S
Units
cm-3
ValidMin
0
ValidMax
100000002004087734272
FillValue
-999
Particle
ParticleType
Molecule
Qualifier
LineOfSight
ParticleQuantity
NumberDensity
AtomicNumber
14
Parameter #29
Name
Initial Predicted Altitude Profile of Oxygen
ParameterKey
ICON_L24_Predicted_O
Description
*Diagnostic* Initial altitude profile of O used by the retrieval, in cm-3, as a function of altitude and time.
Cadence
PT12S
Units
cm-3
ValidMin
0
ValidMax
100000002004087734272
FillValue
-999
Particle
ParticleType
Molecule
Qualifier
LineOfSight
ParticleQuantity
NumberDensity
AtomicNumber
8
Parameter #30
Name
Initial Predicted Altitude Profile of Oxygen Molecules
ParameterKey
ICON_L24_Predicted_O2
Description
*Diagnostic* Initial altitude profile of O2 used by the retrieval, in cm-3, as a function of altitude and time.
Cadence
PT12S
Units
cm-3
ValidMin
0
ValidMax
100000002004087734272
FillValue
-999
Particle
ParticleType
Molecule
Qualifier
LineOfSight
ParticleQuantity
NumberDensity
AtomicNumber
16
Parameter #31
Name
Predicted Ion Temperature
ParameterKey
ICON_L24_Predicted_Temperature
Description
*Diagnostic* Initial altitude profile of temperature used by the retrieval, in K, as a function of altitude and time.
Cadence
PT1S
Units
K
ValidMin
0
ValidMax
Inf
FillValue
NaN
Particle
ParticleType
Ion
Qualifier
Scalar
ParticleQuantity
Temperature
Parameter #32
Name
Retrieved Qeuv on the Disk
ParameterKey
ICON_L24_QEUV
Description
*Diagnostic* Effective solar EUV energy flux, mW/m2.
Cadence
PT12S
Units
mW/m2
ValidMin
0
ValidMax
100000002004087734272
FillValue
-999
Wave
WaveType
Photon
Qualifier
Total
WaveQuantity
EnergyFlux
Parameter #33
Name
Standard Deviation of the Retrieved Nitrogen Molecules
ParameterKey
ICON_L24_Sigma_N2
Description
1 standard deviation of the retrieved N2 from the retrieval, as a function of altitude and time. The data product uncertainties are based on the measurement counting statistics and are lower limits because systematic uncertainties, which are expected to be much larger, are not included. The data processing complexity requires a qualitatively new uncertainty approach that must be derived from first principles.
Cadence
PT12S
Units
cm-3
ValidMin
0
ValidMax
100000002004087734272
FillValue
-999
Particle
ParticleType
Molecule
Qualifier
LineOfSight
ParticleQuantity
NumberDensity
AtomicNumber
14
Parameter #34
Name
Standard Deviation of the Retrieved Oxygen
ParameterKey
ICON_L24_Sigma_O
Description
1 standard deviation of the retrieved O from the retrieval, as a function of altitude and time. The data product uncertainties are based on the measurement counting statistics and are lower limits because systematic uncertainties, which are expected to be much larger, are not included. The data processing complexity requires a qualitatively new uncertainty approach that must be derived from first principles.
Cadence
PT12S
Units
cm-3
ValidMin
0
ValidMax
100000002004087734272
FillValue
-999
Particle
ParticleType
Molecule
Qualifier
LineOfSight
ParticleQuantity
NumberDensity
AtomicNumber
8
Parameter #35
Name
Standard Deviation of the Retrieved Oxygen Molecules
ParameterKey
ICON_L24_Sigma_O2
Description
1 standard deviation of the retrieved O2 from the retrieval, as a function of altitude and time. The data product uncertainties are based on the measurement counting statistics and are lower limits because systematic uncertainties, which are expected to be much larger, are not included. The data processing complexity requires a qualitatively new uncertainty approach that must be derived from first principles.
Cadence
PT12S
Units
cm-3
ValidMin
0
ValidMax
100000002004087734272
FillValue
-999
Particle
ParticleType
Molecule
Qualifier
LineOfSight
ParticleQuantity
NumberDensity
AtomicNumber
16
Parameter #36
Name
Standard Deviation of the Column O/N2
ParameterKey
ICON_L24_Sigma_O_N2'
Description
1 standard deviation of the retrieved O/N2 from the retrieval, as a function of time. The data product uncertainties are based on the measurement counting statistics and are lower limits because systematic uncertainties, which are expected to be much larger, are not included. The data processing complexity requires a qualitatively new uncertainty approach that must be derived from first principles.
Cadence
PT12S
Units
Dimensionless
ValidMin
0
ValidMax
100000002004087734272
FillValue
-999
Mixed
MixedQuantity
Other
Qualifier
Ratio
Parameter #37
Name
Standard Deviation of the Ion Temperature
ParameterKey
ICON_L24_Sigma_Temperature
Description
1 standard deviation of the retrieved temperature from the retrieval, as a function of altitude and time. The data product uncertainties are based on the measurement counting statistics and are lower limits because systematic uncertainties, which are expected to be much larger, are not included. The data processing complexity requires a qualitatively new uncertainty approach that must be derived from first principles.
Cadence
PT1S
Units
K
ValidMin
0
ValidMax
Inf
FillValue
-999
Particle
ParticleType
Ion
Qualifier
Scalar
ParticleQuantity
Temperature
Parameter #38
Name
Solar Zenith Angle of the Retrieval
ParameterKey
ICON_L24_Solar_Zenith_Angle
Description
Solar zenith angle of the retrieval, defined at 150 km tangent altitude, in WGS.
Cadence
PT12S
Units
degrees
ValidMin
0
ValidMax
80
FillValue
-999
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #39
Name
Retrieved Altitude Profile of Temperature
ParameterKey
ICON_L24_Temperature
Description
Retrieved altitude profile of temperature from the retrieval, in K, as a function of altitude and time.
Cadence
PT1S
Units
K
ValidMin
0
ValidMax
100000002004087734272
FillValue
-999
Particle
ParticleType
Ion
Qualifier
Scalar
ParticleQuantity
Temperature
Parameter #40
Name
UTC Time String
ParameterKey
ICON_L24_UTC_Time
Description
UTC time corresponding to the retrieved parameters, in string format, as a function of time, in the format: 2017-05-27/00:00:01.435.
Cadence
PT12S
FillValue
Bad
Support
Qualifier
Magnitude
SupportQuantity
Temporal
Parameter #41
Name
Whole Day Retrieval Flags
ParameterKey
ICON_L24_Whole_Day_Retrieval_Flag
Description
Single flag set for whole day, where 0 = nominal data set, 1 = whole day skipped because no solar zenith angles were within range.
Cadence
PT12S
Units
integer
ValidMin
0
ValidMax
1
FillValue
-999
Support
Qualifier
Uncertainty
SupportQuantity
DataQuality