SPASE Resource Description

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} function getVersionedBibTeX(bibtex) { /* Add version field as suggested by August (Gus) Muench, Journals Data Editor, American Astronomical Society (email dated 7/7/25) */ const accessVersion = ", version={Accessed on " + currentIsoDateStr + "}"; const modifiedBibtex = bibtex.substring(0, bibtex.lastIndexOf("}")) + accessVersion + "}"; return modifiedBibtex; } function getBlob(text) { return new Blob([text], { type: "text/plain"}); } function clipboardAlert(text) { alert(text + "\nCopied to clipboard"); } function clipCitation(doi) { document.body.style.cursor = 'wait'; let url = "https://citation.doi.org/format?doi=" + doi.replace("https://doi.org/", "") + String.fromCodePoint(38) + "style=bibtex" + String.fromCodePoint(38) + "lang=en-US"; const text = new ClipboardItem({ "text/plain": fetch(url) .then(getResponseText) .then(getVersionedBibTeX) .then(getBlob) }); navigator.clipboard.write([text]); text.getType("text/plain") .then(getResponseText) .then(clipboardAlert); } function toggle_usa_banner_details() { const details = document.getElementById("usa-banner-details"); const indicator = document.getElementById("usa-banner-indicator"); if (details.style.display === "none") { details.style.display = "block"; indicator.textContent = "^"; } else { details.style.display = "none"; indicator.textContent = "v"; } } const monthName=new Array("January","February","March","April","May","June","July","August","September","October","November","December"); let currentDate = new Date(); let currentIsoDateStr = currentDate.toISOString().substring(0, 10); let currentDateStr = currentDate.getFullYear() + '-' + monthName[currentDate.getMonth()] + '-' + currentDate.getDate(); Data Access HAPI: CDAWeb HAPI Server HTTPS from SPDF CDAWeb WebService: CDAWeb Programmatic Data Access ICON The Far Ultra Violet Imaging Spectrograph Dayside Images var authors='Stephan, A. W.'; document.write(authors); (2023). ICON The Far Ultra Violet Imaging Spectrograph Dayside Images . [Data set]. Space Physics Data Facility. https://doi.org/10.48322/w3qs-ed95. Accessed on document.write(currentDateStr);. Note: Proper references, including Copy BibTeX Citation 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/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. Metadata Rights CC0-1.0: Creative Commons Zero v1.0 Universal Note CC0 1.0 Universal is the Creative Commons license applicable to all publicly available SPASE metadata descriptions. The actual data/software may be subject to a different license. View XML | Edit Details Version:2.7.1 NumericalData ResourceID spase://NASA/NumericalData/ICON/FUV/L2/Day/PT12S NamingAuthority NASA ResourceType NumericalData ResourceHeader ResourceName ICON The Far Ultra Violet Imaging Spectrograph Dayside Images AlternateName FUV Dayside Images DOI https://doi.org/10.48322/w3qs-ed95 ReleaseDate 2026-07-21 12:05:18Z 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 RevisionEvent ReleaseDate 2025-10-02 15:11:59Z Note Updated PublishedBy name to match ROR Registry. Added ResourceType and NamingAuthority. Changed http to https in top-level schemaLocation attribute. Matched version number in schemaLocation attribute to updated value in Version tag. ZCB RevisionEvent ReleaseDate 2025-12-04 13:29:31Z Note Added MetadataRightsList and RightsList(s). Updated to 2.7.1. ZCB RevisionEvent ReleaseDate 2026-02-17 13:29:31Z Note Revised Acknowledgements. JMW RevisionEvent ReleaseDate 2026-06-10 13:29:31Z Note Updsated StopDate. JMW RevisionEvent ReleaseDate 2026-06-26 13:17:45Z Note Add 'Z' to PublicationDate, TemporalDescription:TimeSpan:StopDate. ZCB RevisionEvent ReleaseDate 2026-07-21 12:05:18Z Note Added HelioData InformationURL. JWL 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 00:00:00Z PublishedBy Space Physics Data Facility Funding Agency National Aeronautics and Space Administration Project Explorers Program AwardNumber NNG12FA45C Contacts Role Person StartDate StopDate Note 1. PrincipalInvestigator spase://SMWG/Person/Andrew.W.Stephan InformationURL Name Additional information on ICON URL https://icon.ssl.berkeley.edu/ Description ICON spacecraft Homepage. InformationURL Name The far ultra-violet Imager on the ICON mission URL https://doi.org/10.1007/s11214-017-0386-0 Description Space Science Reviews, 212(1-2), pp.655-696. DOI: 10.1007/s11214-017-0386-0 InformationURL Name HelioData URL https://helio.data.nasa.gov/dataset/ICON_FUV_L2_Day_PT12S Description The HelioData dataset page provides an overview of the dataset with access links, associated variables, and more. AccessInformation RepositoryID spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb 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 https://cdaweb.gsfc.nasa.gov/hapi Style HAPI ProductKey ICON_L2-4_FUV_DAY 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 spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb 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 https://spdf.gsfc.nasa.gov/pub/data/icon/l2/l2-4_fuv_day/ ProductKey ICON_L2-4_FUV_DAY Description Access to Data in NetCDF Format via https from SPDF AccessURL Name CDAWeb URL https://cdaweb.gsfc.nasa.gov/cgi-bin/eval2.cgi?dataset=ICON_L2-4_FUV_DAY&index=sp_phys 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. Thomas Immel. Please acknowledge the Data Providers and CDAWeb when using these Data. AccessInformation RepositoryID spase://SMWG/Repository/NASA/GSFC/SPDF Availability Online AccessRights Open AccessURL Name CDAWeb Programmatic Data Access URL https://cdaweb.gsfc.nasa.gov/WS/cdasr/1/dataviews/sp_phys/datasets/ICON_L2-4_FUV_DAY/clientLibraryExample/ 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. Thomas Immel. Please acknowledge the Data Providers and CDAWeb when using these Data. ProcessingLevel Calibrated ProviderName ICON FUV team InstrumentIDs spase://SMWG/Instrument/ICON/FUV MeasurementType ImageIntensity TemporalDescription TimeSpan StartDate 2019-11-16 00:00:00Z StopDate 2022-11-25 23:59:00Z 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