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The ICON Far Ultra Violet Daytime Column O/N2

ResourceID
spase://SMWG/NumericalData/ICON/FUV/L3/Column-ON2/PT10D

Description

ICON FUV Daytime observations. 48-day windows of data from the L2.4 v07 product are collected into longitude, latitude, and local time bins. Mean and standard deviations of each parameter are reported in this file. 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).

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Details

Version:2.7.1

MetadataRightsList

Rights
SchemeURI
https://spdx.org/licenses/
RightsIdentifierScheme
SPDX
RightsIdentifier
CC0-1.0
RightsURI
https://spdx.org/licenses/CC0-1.0.html
RightsName
Creative Commons Zero v1.0 Universal
Note
CC0 1.0 Universal is the Creative Commons license applicable to all publicly available SPASE metadata descriptions

Version:2.7.1

NumericalData

ResourceID
spase://SMWG/NumericalData/ICON/FUV/L3/Column-ON2/PT10D
NamingAuthority
NASA
ResourceType
NumericalData
ResourceHeader
ResourceName
The ICON Far Ultra Violet Daytime Column O/N2
ReleaseDate
2026-06-09 00:00:00Z
RevisionHistory
RevisionEvent
ReleaseDate
2026-06-10 00:00:00Z
Note
First release
Description

ICON FUV Daytime observations. 48-day windows of data from the L2.4 v07 product are collected into longitude, latitude, and local time bins. Mean and standard deviations of each parameter are reported in this file. 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).

Acknowledgement
National Aeronautics and Space Administration; Dr. Thomas Immel; Dr. Andrew W. Stephan;
Funding
Agency
National Aeronautics and Space Administration
Project
Explorers Program
AwardNumber
contracts NNG12FA45C
Funding
Agency
National Aeronautics and Space Administration
Project
Explorers Program
AwardNumber
contracts NNG12FA42I
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
RightsList
Rights
SchemeURI
https://spdx.org/licenses/
RightsIdentifierScheme
SPDX
RightsIdentifier
CC0-1.0
RightsURI
https://spdx.org/licenses/CC0-1.0.html
RightsName
Creative Commons Zero v1.0 Universal
Note
CC0 1.0 Universal is the Creative Commons license applicable to all publicly available NASA Heliophysics data products
AccessURL
Name
CDAWeb HAPI Server
URL
Style
HAPI
ProductKey
ICON_L3-3_Column-ON2
Description

Web Service to this product using the HAPI interface.

Format
NetCDF
Acknowledgement
Please acknowledge Dr. Thomas Immel. Please acknowledge the Data Providers and CDAWeb when using these Data.
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
RightsList
Rights
SchemeURI
https://spdx.org/licenses/
RightsIdentifierScheme
SPDX
RightsIdentifier
CC0-1.0
RightsURI
https://spdx.org/licenses/CC0-1.0.html
RightsName
Creative Commons Zero v1.0 Universal
Note
CC0 1.0 Universal is the Creative Commons license applicable to all publicly available NASA Heliophysics data products
AccessURL
Name
HTTPS from SPDF
URL
ProductKey
ICON_L3-3_Column-ON2
Description

Access to Data in NetCDF Format via https from SPDF

AccessURL
Name
CDAWeb
URL
ProductKey
ICON_L3-3_Column-ON2
Description

Access to NetCDFs via NASA/GSFC CDAWeb

Format
NetCDF
Encoding
None
Acknowledgement
Please acknowledge 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
2019-12-09 10:13:00Z
StopDate
2022-11-03 11:28:35
Cadence
PT30S
ObservedRegion
Earth.NearSurface.Atmosphere
ObservedRegion
Earth.NearSurface.Ionosphere
Parameter #1
Name
Epoch Time
ParameterKey
Epoch
Description

Milliseconds since 1970-01-01 00:00:00 UTC at middle of measurement integration. Time corresponding to the middle of each 48 day average, in milliseconds since Jan 1 1970.

Cadence
P10D
Units
ms
ValidMin
0
ValidMax
6000000000000
FillValue
-999
Support
Qualifier
Magnitude
SupportQuantity
Temporal
Parameter #2
Name
48 day bins
ParameterKey
ICON_L33_Dates
Description

Dates used in each 48 day bin, in string format, in the format: YYYY-MM-DD. Year (YYYY), Month(MM), and Day (DD).

Cadence
P10D
FillValue
-999
Support
Qualifier
Magnitude
SupportQuantity
Temporal
Parameter #3
Name
Mean Binned Disk ON2 Ratio
ParameterKey
ICON_L33_Disk_ON2
Description

Mean value of Disk O/N2, taken over all good quality L2 datapoints in a 48-day time-span, as a function of longitude, latitude, time. Derived from ICON_L24_Disk_ON2.

Cadence
P10D
ValidMin
0
ValidMax
1.000000020040877e+20
FillValue
-999
Mixed
MixedQuantity
Other
Qualifier
Ratio
Parameter #4
Name
Number of data points
ParameterKey
ICON_L33_DataPoints
Description

Number of data points in each 48 day average, as a function of longitude, latitude, time.

Cadence
P10D
Units
counts
ValidMin
0
ValidMax
1.000000020040877e+20
FillValue
-999
Support
Qualifier
Total
SupportQuantity
Other
Parameter #5
Name
Sigma Disk O/N2
ParameterKey
ICON_L33_Sigma_Disk_ON2
Description

One standard deviation of the good Disk O/N2 values used to compute the mean, as a function of longitude, latitude, time.

Cadence
P10D
ValidMin
0
ValidMax
1.000000020040877e+20
FillValue
-999
Mixed
MixedQuantity
Other
Qualifier
Ratio
Parameter #6
Name
Local Time Bin
ParameterKey
ICON_L33_LocalTime
Description

Local time binned in 0.5 hour intervals, local time +/- 0.25 hours.

Cadence
P10D
Units
hours
ValidMin
6.25
ValidMax
18.25
FillValue
-999
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #7
Name
Latitude Bin
ParameterKey
ICON_L33_Latitude
Description

Latitude of the O/N2 data, binned in 5 degree intervals, latitude +/- 2.5 degrees. Derived from ICON_L24_Disk_Latitude.

Cadence
P10D
Units
degrees
ValidMin
-20
ValidMax
35
FillValue
-999
Support
Qualifier
Direction
SupportQuantity
Positional
Parameter #8
Name
Longitude Bin
ParameterKey
ICON_L33_Longitude
Description

Longitude of the O/N2 data, binned in 15 degree intervals, longitude +/- 7.5 degrees. Derived from ICON_L24_Disk_Longitude.

Cadence
P10D
Units
degrees
ValidMin
0
ValidMax
360
FillValue
-999
Support
Qualifier
Direction
SupportQuantity
Positional