HDPWS

ICON The Far Ultra Violet Imaging Spectrograph Dayside Images

(2023). ICON The Far Ultra Violet Imaging Spectrograph Dayside Images . [Data set]. NASA Space Physics Data Facility. https://doi.org/10.48322/w3qs-ed95. Accessed on .
Citations should include the "Accessed on date" as shown at the end of the reference above.

ResourceID
spase://NASA/NumericalData/ICON/FUV/L2/Day/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 image 8 times per second and perform Time Delay Integration (TDI) to remove the motion-blur from the images. A turret is used to steer the field of view of the instrument left to right to ensure it always looks along the magnetic meridian (towards the magnetic pole). This describes the data product for ICON FUV Daytime O/N2 (DP 2.4). The ratio of oxygen to nitrogen in the thermosphere is obtained from the two channels of ICON FUV instrument data in, through an inversion process described in https://doi.org/10.1007/s11214-018-0477-6. The L2 FUV Daytime files are produced from the L1 FUV files.

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Version:2.6.0

NumericalData

ResourceID
spase://NASA/NumericalData/ICON/FUV/L2/Day/PT12S
ResourceHeader
ResourceName
ICON The Far Ultra Violet Imaging Spectrograph Dayside Images
AlternateName
FUV Dayside Images
DOI
https://doi.org/10.48322/w3qs-ed95
ReleaseDate
2024-05-02 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.
RevisionEvent
ReleaseDate
2024-05-02 00:00:00Z
Note
Updated SPASE version. Edited AccessInformation. 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 image 8 times per second and perform Time Delay Integration (TDI) to remove the motion-blur from the images. A turret is used to steer the field of view of the instrument left to right to ensure it always looks along the magnetic meridian (towards the magnetic pole). This describes the data product for ICON FUV Daytime O/N2 (DP 2.4). The ratio of oxygen to nitrogen in the thermosphere is obtained from the two channels of ICON FUV instrument data in, through an inversion process described in https://doi.org/10.1007/s11214-018-0477-6. The L2 FUV Daytime files are produced from the L1 FUV files.
Acknowledgement
National Aeronautics and Space Administration; Dr. Andrew W. Stephan; Dr. Thomas Immel
PublicationInfo
Authors
Stephan, A. W.
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 NNG12FA45C
Contacts
Role Person StartDate StopDate Note
1. PrincipalInvestigator spase://SMWG/Person/Andrew.W.Stephan
InformationURL
Name
Additional information on ICON
URL
Description
ICON spacecraft 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
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
CDAWeb HAPI Server
URL
Style
HAPI
ProductKey
ICON_L2-4_FUV_DAY
Description
Web Service to this product using the HAPI interface.
Format
NetCDF
Acknowledgement
Please acknowledge Dr. Farzad Kamalabadi and Dr. Thomas Immel. 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
Description
Access to Data in NetCDF Format via https from SPDF
AccessURL
Name
CDAWeb
URL
ProductKey
ICON_L2-4_FUV_DAY
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/$Y
AccessFilenameTemplate
icon_l2-4_fuv_day_$Y$m$d_v06r000.nc
Acknowledgement
Please acknowledge Dr. Farzad Kamalabadi and Dr. Thomas Immel. 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
Description
Access to this data from common programming environments. Note: this AccessInformation element was added by HDPWS.
Format
Binary
Acknowledgement
Please acknowledge Dr. Farzad Kamalabadi and Dr. Thomas Immel. 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
RelativeStopDate
-P2M
Cadence
PT12S
ObservedRegion
Earth.NearSurface.Atmosphere
ObservedRegion
Earth.NearSurface.Ionosphere
Parameter #1
Name
Epoch Time
ParameterKey
Epoch
Description
Sample time, midpoint of exposure. Number of msec since Jan 1, 1970.
Cadence
PT12S
Units
ms
ValidMin
0
ValidMax
6000000000000
FillValue
-999
Support
Qualifier
Magnitude
SupportQuantity
Temporal
Parameter #2
Name
Disk Short Wave Emission
ParameterKey
ICON_L24_1356_Emission
Description
Short wave disk column emisison rate.
Cadence
PT12S
Units
Rayleighs
ValidMin
-100.000000
ValidMax
10000000000
FillValue
-999
Wave
WaveType
Photon
Qualifier
LineOfSight
WaveQuantity
Intensity
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
Line of Sight Zenith Angle
ParameterKey
ICON_L24_Disk_LOS_Zen_Angle
Description
Line of sight zenith angle corresponding to disk retrieval.
Cadence
PT12S
Units
degrees
ValidMin
0
ValidMax
180
FillValue
-999
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #5
Name
Retrieved Disk Geodetic Latitude
ParameterKey
ICON_L24_Disk_Latitude
Description
Geodetic latitude (WGS84) corresponding to disk retrieval.
Cadence
PT12S
Units
degrees
ValidMin
-90
ValidMax
90
FillValue
-999
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #6
Name
Retrieved Disk Geodetic Longitude
ParameterKey
ICON_L24_Disk_Longitude
Description
Geodetic longitude (WGS84) corresponding to disk retrieval.
Cadence
PT12S
Units
degrees
ValidMin
-90
ValidMax
90
FillValue
-999
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #7
Name
Magnetic Latitude on Disk
ParameterKey
ICON_L24_Disk_Magnetic_Latitude
Description
Quasi-Dipole Magnetic Latitude at 150 km at Disk Retrieval location, in degrees.
Cadence
PT12S
Units
degrees
ValidMin
-90
ValidMax
90
FillValue
-999
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #8
Name
Magnetic Longitude on Disk
ParameterKey
ICON_L25_Magnetic_Longitude
Description
Quasi-Dipole Magnetic Longitude at 150 km at Disk Retrieval location, in degrees.
Cadence
PT12S
Units
degrees
ValidMin
0
ValidMax
360
FillValue
-999
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #9
Name
Retrieved disk column O/N2
ParameterKey
ICON_L24_Disk_ON2
Description
Retrieved column O/N2 ratio on the disk.
Cadence
PT12S
Units
Dimensionless
ValidMin
0
ValidMax
200
FillValue
-999
Mixed
MixedQuantity
Other
Qualifier
Ratio
Parameter #10
Name
Retrieved Qeuv on the Disk
ParameterKey
ICON_L24_Disk_QEUV
Description
*Diagnostic* Effective solar EUV energy flux, mmW/m2 - multiply by model 4 * model 7 to obtain solar flux required for dayglow fit on the disk.
Cadence
PT12S
Units
mW/m2
ValidMin
0
ValidMax
100000002004087734272
FillValue
-999
Wave
WaveType
Photon
Qualifier
Total
WaveQuantity
EnergyFlux
Parameter #11
Name
Quality Flags
ParameterKey
ICON_L24_Disk_Retrieval_Flags
Description
Disk retrieval quality flag, where 0 = nominal retrieval, 1 = Disk short/long wave ratio out of model range, 2 = Disk O/N2 value out of expected range, 3 = Disk P/N2 uncertainty out of expected range.
Cadence
PT12S
ValidMin
0
ValidMax
10
FillValue
-999
Support
Qualifier
Scalar
SupportQuantity
DataQuality
Parameter #12
Name
Retrieved Disk Solar Zenith Angle
ParameterKey
ICON_L24_Disk_SZA
Description
Solar zenith angle corresponding to disk retrieval.
Cadence
PT12S
Units
degrees
ValidMin
0
ValidMax
180
FillValue
-999
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #13
Name
Retrieved Disk Column O/N2 Uncertainty
ParameterKey
ICON_L24_Disk_Sigma_ON2
Description
Uncertainty in retrieved column O/N2 ratio on the disk, based on spread in reported uncertainty in input data.
Cadence
PT12S
Units
Dimensionless
ValidMin
0
ValidMax
200
FillValue
-999
Support
Qualifier
Uncertainty
SupportQuantity
DataQuality
Parameter #14
Name
F10.7 Used in Retreival
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 #15
Name
Initial Duess Disk Column O/N2
ParameterKey
ICON_L24_Initial_Disk_ON2
Description
Initial guess of column O/N2 ratio on the disk.
Cadence
PT12S
Units
Dimensionless
ValidMin
0
ValidMax
200
FillValue
-999
Mixed
MixedQuantity
Other
Qualifier
Ratio
Parameter #16
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 #17
Name
Disk Long Wave Emission
ParameterKey
ICON_L24_LBH_Emission
Description
Long wave disk column emisison rate.
Cadence
PT12S
Units
Rayleighs
ValidMin
-100
ValidMax
10000000000
FillValue
-999
Wave
WaveType
Photon
Qualifier
Scalar
WaveQuantity
Intensity
Parameter #18
Name
Quality Flag of Profiles
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
Units
N/A
ValidMin
0
ValidMax
127
FillValue
127
Support
Qualifier
Uncertainty
SupportQuantity
DataQuality
Parameter #19
Name
Limb Retrieval Flags
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
Units
integer
ValidMin
0
ValidMax
10
FillValue
-999
Support
Qualifier
Uncertainty
SupportQuantity
DataQuality
Parameter #20
Name
Local Time on the Disk
ParameterKey
ICON_L24_Local_Solar_Time_Disk
Description
Local solar time of the retrieval on the disk, in hours.
Cadence
PT12S
Units
hours
ValidMin
0
ValidMax
24
FillValue
-999
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #21
Name
Covariance Matrix of the Model Parameters
ParameterKey
ICON_L24_Model_Covariance
Description
Covariance matrix of the model parameters found by the algorithm, as a function of time.
Cadence
PT12S
Units
unitless scalars
ValidMin
-1000
ValidMax
1000
FillValue
-999
Support
Qualifier
Tensor
SupportQuantity
Other
Parameter #22
Name
Lower Limits of the Model Parameters
ParameterKey
ICON_L24_Model_Lower_Limit
Description
*Diagnostic* Lower limits of the model parameters used by the algorithm, as a function of time.
Cadence
PT12S
Units
unitless
ValidMin
-1000
ValidMax
1000
FillValue
-999
Support
Qualifier
Fit
SupportQuantity
Other
Parameter #23
Name
Upper Limits of the Model Parameters
ParameterKey
ICON_L24_Model_Upper_Limit
Description
*Diagnostic* Upper limits of the model parameters used by the algorithm, as a function of time.
Cadence
PT12S
Units
unitless
ValidMin
-1000
ValidMax
1000
FillValue
-999
Support
Qualifier
Fit
SupportQuantity
Other
Parameter #24
Name
Altitude of the ICON 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
0
ValidMax
1000
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
Initial Guess Disk Short Wave Emission
ParameterKey
ICON_L24_Predicted_1356_Disk_Emission
Description
Initial guess short wave disk column emisison rate.
Cadence
PT12S
Units
Rayleighs
ValidMin
-100
ValidMax
10000000000
FillValue
-999
Wave
WaveType
Photon
Qualifier
Fit
WaveQuantity
Intensity
Parameter #28
Name
Initial Guess Disk Short Wave Emission
ParameterKey
ICON_L24_Predicted_LBH_Disk_Emission
Description
Initial guess short wave disk column emisison rate.
Cadence
PT12S
Units
Rayleighs
ValidMin
-100
ValidMax
10000000000
FillValue
-999
Wave
WaveType
Photon
Qualifier
Fit
WaveQuantity
Intensity
Parameter #29
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 #30
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