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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 FTPS from SPDF (not with most browsers) HTTPS from SPDF Gold Level L2 Solar EUV proxy var authors='Eastes, Richard; Daniell, Robert E.'; document.write(authors); (2025). Gold Level L2 Solar EUV proxy. [Data set]. Space Physics Data Facility. https://doi.org/10.48322/zwyq-g988. 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/GOLD/L2/QEUV/PT8S Description The GOLD solar irradiance proxy (QEUV) is a proxy for the integrated solar EUV irradiance below 45 nm, which can be derived directly from far ultraviolet (FUV) radiance measurements. QEUV is a dayside disk data product, derived from the GOLD DAY measurement mode. Algorithm heritage The disk QEUV retrieval algorithm was originally developed for use with GUVI and SSUSI images (Strickland et al., [1995]). The GOLD implementation of this algorithm takes advantage of GOLD’s ability to transmit the full spectrum to maximize the signal-to-noise ratio and eliminate atomic emission lines that contaminate the N2 LBH bands (e.g., N I 149.3 nm). This algorithm has been extensively documented and applied (e.g., Strickland et al. [2004]; Evans et al., [1995]). The associated GOLD Level 2 data product is called QEUV. References -Evans, J. S., D. J. Strickland and R. E. Huffman (1995), Satellite remote sensing of thermospheric O/N2 and solar EUV: 2. Data analysis, J. Geophys. Res., Vol. 100, NO. A7, pages 12,227-12,233. -Strickland, D. J., J. S. Evans, and L. J. Paxton (1995), Satellite remote sensing of thermospheric O/N2 and solar EUV: 1. Theory, J. Geophys. Res., 110, A7, pages 12,217-12,226. -Strickland, D. J., J. L. Lean, R. R. Meier, A. B. Christensen, L. J. Paxton, D. Morrison, J. D. Craven, R. L. Walterscheid, D. L. Judge, and D. R. McMullin, (2004), Solar EUV irradiance variability derived from terrestrial far ultraviolet dayglow observations, Vol. 31, L03801, doi:10.1029/2003GL018415. 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/GOLD/L2/QEUV/PT8S NamingAuthority NASA ResourceType NumericalData ResourceHeader ResourceName Gold Level L2 Solar EUV proxy DOI https://doi.org/10.48322/zwyq-g988 ReleaseDate 2026-06-26 13:17:03Z RevisionHistory RevisionEvent ReleaseDate 2020-09-14 16:47:17Z Note Only known prior ReleaseDate of the metadata RevisionEvent ReleaseDate 2025-11-14 16:02:21Z Note Added PublicationInfo. Added ResourceType and NamingAuthority. Changed http to https in top-level schemaLocation attribute. Fixed version number separator in top-level schemaLocation attribute. Matched version number in schemaLocation attribute to updated value in Version tag. ZCB RevisionEvent ReleaseDate 2025-12-04 13:29:18Z Note Added MetadataRightsList and RightsList(s). Updated to 2.7.1. ZCB RevisionEvent ReleaseDate 2026-06-26 13:17:03Z Note Add 'Z' to TemporalDescription:TimeSpan:StartDate. ZCB Description The GOLD solar irradiance proxy (QEUV) is a proxy for the integrated solar EUV irradiance below 45 nm, which can be derived directly from far ultraviolet (FUV) radiance measurements. QEUV is a dayside disk data product, derived from the GOLD DAY measurement mode. Algorithm heritage The disk QEUV retrieval algorithm was originally developed for use with GUVI and SSUSI images (Strickland et al., [1995]). The GOLD implementation of this algorithm takes advantage of GOLD’s ability to transmit the full spectrum to maximize the signal-to-noise ratio and eliminate atomic emission lines that contaminate the N2 LBH bands (e.g., N I 149.3 nm). This algorithm has been extensively documented and applied (e.g., Strickland et al. [2004]; Evans et al., [1995]). The associated GOLD Level 2 data product is called QEUV. References -Evans, J. S., D. J. Strickland and R. E. Huffman (1995), Satellite remote sensing of thermospheric O/N2 and solar EUV: 2. Data analysis, J. Geophys. Res., Vol. 100, NO. A7, pages 12,227-12,233. -Strickland, D. J., J. S. Evans, and L. J. Paxton (1995), Satellite remote sensing of thermospheric O/N2 and solar EUV: 1. Theory, J. Geophys. Res., 110, A7, pages 12,217-12,226. -Strickland, D. J., J. L. Lean, R. R. Meier, A. B. Christensen, L. J. Paxton, D. Morrison, J. D. Craven, R. L. Walterscheid, D. L. Judge, and D. R. McMullin, (2004), Solar EUV irradiance variability derived from terrestrial far ultraviolet dayglow observations, Vol. 31, L03801, doi:10.1029/2003GL018415. Acknowledgement National Aeronautics and Space Administration; Dr. Richard Eastes PublicationInfo Authors Eastes, Richard; Daniell, Robert E. PublicationDate 2025-11-14 16:02:21Z PublishedBy Space Physics Data Facility Contacts Role Person StartDate StopDate Note 1. PrincipalInvestigator spase://SMWG/Person/Richard.Eastes 2. CoInvestigator spase://SMWG/Person/Robert.E.Daniell 3. ProjectManager spase://SMWG/Person/Andrey.Krywonos 4. MetadataContact spase://SMWG/Person/James.M.Weygand InformationURL Name GOLD Homepage web page URL https://gold.cs.ucf.edu/ Description GOLD web page with news and other information. InformationURL Name GOLD Missions Space Science Reviews Article URL https://doi.org/10.1007/s11214-017-0392-2 Description Eastes, R.W., McClintock, W.E., Burns, A.G. et al. Space Sci. Rev. (2017) vol. 212, pp.383. PriorIDs spase://VSPO/NumericalData/GOLD/L2/QEUV/PT8S spase://NASA/NumericalData/SES-14/GOLD/L2/QEUV/PT8S AccessInformation RepositoryID spase://SMWG/Repository/NASA/GSFC/SPDF 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 FTPS from SPDF (not with most browsers) URL ftps://spdf.gsfc.nasa.gov/pub/data/gold/level2/ Description FTPS access to Gold Level L2 data AccessURL Name HTTPS from SPDF URL https://spdf.gsfc.nasa.gov/pub/data/gold/level2/ Description HTTPS access to Gold Level L2 data Format NetCDF Acknowledgement Space Physics Data Facility of the NASA Goddard Space Flight Center; Robert E McGuire ProcessingLevel Calibrated ProviderName GOLD ProviderResourceName Gold Level L2 Solar EUV proxy ProviderProcessingLevel Level 2 ProviderVersion 1 InstrumentIDs spase://SMWG/Instrument/GOLD MeasurementType ImageIntensity TemporalDescription TimeSpan StartDate 2018-10-05 00:00:00Z RelativeStopDate P1D Cadence PT8S ObservedRegion Earth.NearSurface.Ionosphere Keywords Solar EUV proxy GOLD SES-14 Parameter #1 Name Random Uncertainty in N2 LBH brightness ParameterKey n2_lbh_unc_ran Description Random uncertainty in N2 LBH brightness. Cadence PT8S Units Rayleighs Structure Size 92 40 ValidMin 0 ValidMax 100000 FillValue 9.9692e+36 Support Qualifier Uncertainty SupportQuantity Other Parameter #2 Name Random Uncertainty in in retrieved QEUV ParameterKey qeuv_unc_ran Description Random uncertainty in retrieved QEUV. Cadence PT8S Units erg/cm2/s Structure Size 92 40 ValidMin 0 ValidMax 10 FillValue 9.9692e+36 Support Qualifier Uncertainty SupportQuantity Other Parameter #3 Name DEUV Lookup Table ParameterKey qeuv_lookup_table Description QEUV lookup table filename. Cadence PT8S Structure Size 50 40 Support SupportQuantity Other Parameter #4 Name O/N2 Ratio Quality Flag ParameterKey on2_dqi Description ON2 data quality index. Cadence PT8S Structure Size 92 40 ValidMin 0 ValidMax 2147483647 FillValue -2147483647 Support Qualifier Scalar SupportQuantity Other Parameter #5 Name Retrieved O/N2 column density ratio ParameterKey on2 Description Retrieved O/N2 column density ratio used in QEUV retrieval. Cadence PT8S Structure Size 92 40 ValidMin 0 ValidMax 5 FillValue 9.9692e+36 Mixed MixedQuantity Other Qualifier Ratio Parameter #6 Name Random Uncertainty in Oxygen 135.6 nm Brightness ParameterKey oi_1356_unc_ran Description Random uncertainty in oxygen 135.6 nm brightness. Cadence PT8S Units Rayleighs Structure Size 92 40 ValidMin 0 ValidMax 100000 FillValue 9.9692e+36 Wave WaveType Photon Qualifier Uncertainty WaveQuantity Intensity Parameter #7 Name Systematic Uncertainty in in retrieved QEUV ParameterKey qeuv_unc_ran Description Systematic uncertainty in retrieved QEUV. Cadence PT8S Units erg/cm2/s Structure Size 92 40 ValidMin 0 ValidMax 10 FillValue 9.9692e+36 Support Qualifier Uncertainty SupportQuantity Other Parameter #8 Name Scan Start Time ParameterKey scan_start_time Description UTC start time of scan, e.g., "2017-06-21T23:46:38.015Z". Cadence PT8S Structure Size 50 40 FillValue ' ' Support Qualifier Magnitude SupportQuantity Temporal Parameter #9 Name Retrieved QEUV Value ParameterKey qeuv Description Retrieved QEUV value. Cadence PT8S Units erg/cm2/s Structure Size 92 40 ValidMin 0 ValidMax 10 FillValue 9.9692e+36 Support Qualifier Uncertainty SupportQuantity Other Parameter #10 Name Solar Zenith Angle ParameterKey solar_zenith_angle Description Solar zenith angle at tangent point. Cadence PT8S Units degrees Structure Size 92 40 ValidMin 0 ValidMax 180 FillValue 9.9692e+36 Support Qualifier Direction SupportQuantity Positional Parameter #11 Name Systematic Uncertainty in O/N2 Ratio ParameterKey on2_unc_sys Description Systematic uncertainty in ON2. Cadence PT8S Structure Size 92 40 ValidMin 0 ValidMax 5 FillValue 9.9692e+36 Support Qualifier Uncertainty SupportQuantity Other Parameter #12 Name Model Uncertainty in O/N2 Ratio ParameterKey on2_unc_mod Description Model uncertainty in retrieved O/N2 ratio. Cadence PT8S Structure Size 92 40 ValidMin 0 ValidMax 5 FillValue 9.9692e+36 Support Qualifier Uncertainty SupportQuantity Other Parameter #13 Name Systematic Uncertainty in N2 LBH brightness ParameterKey n2_lbh_unc_sys Description Systematic uncertainty in N2 LBH brightness. Cadence PT8S Units Rayleighs Structure Size 92 40 ValidMin 0 ValidMax 100000 FillValue 9.9692e+36 Support Qualifier Uncertainty SupportQuantity Other Parameter #14 Name UTC time ParameterKey time_utc Description UTC date/time string: "2017-06-21T23:46:38.015Z". Cadence PT8S Structure Size 50 92 40 FillValue ' ' Support Qualifier Magnitude SupportQuantity Temporal Parameter #15 Name L1C File Name ParameterKey input_l1c_file Description L1C file name for each occultation. Cadence PT8S Structure Size 50 40 FillValue ' ' Support Qualifier Scalar SupportQuantity Other Parameter #16 Name N2 LBH brightness ParameterKey radiance_n2_lbh Description N2 LBH brightness used in retrieval. Cadence PT8S Units nm Structure Size 92 40 ValidMin 0 ValidMax 100000 FillValue 9.9692e+36 Wave WaveType Photon Qualifier Scalar WaveQuantity Intensity Parameter #17 Name QEUV data Quality Flag ParameterKey qeuv_dqi Description QEUV data quality index per pixel. 0 No known data quality issues. 1 Invalid wavelength mask. 2 No valid input. 4 No valid output. 8 Insufficient latitude coverage. 16 Invalid lookup table. Pixel Level Cadence PT8S Structure Size 92 40 ValidMin 0 ValidMax 2147483647 FillValue -2147483647 Support Qualifier Scalar SupportQuantity Other Parameter #18 Name Hemisphere Scanned ParameterKey hemisphere Description Hemisphere scanned (‘N’ or ‘S’). Cadence PT8S Structure Size 50 40 FillValue ' ' Support Qualifier Scalar SupportQuantity Other Parameter #19 Name Mask Defining OI 1356 Bandpass ParameterKey mask_oi_1356 Description Wavelength mask defining OI 1356 bandpass used in retrieval. Cadence PT8S Structure Size 4001 ValidMin 0 ValidMax 1 FillValue -2147483647 Support SupportQuantity Other Parameter #20 Name GOLD channel ParameterKey channel Description GOLD channel (‘A’ or ‘B’). Cadence PT8S Structure Size 50 40 Support Qualifier Scalar SupportQuantity Other Parameter #21 Name Random Uncertainty in O/N2 Ratio ParameterKey on2_unc_ran Description Random uncertainty in retrieved O/N2 ratio. Cadence PT8S Structure Size 92 40 ValidMin 0 ValidMax 5 FillValue 9.9692e+36 Support Qualifier Uncertainty SupportQuantity Other Parameter #22 Name Overall Quality Flag ParameterKey dqi Description NMAX data quality index (see table below). Cadence PT8S Structure Size 40 ValidMin 0 ValidMax 2147483647 FillValue -2147483647 Support Qualifier Scalar SupportQuantity Other Parameter #23 Name Model Uncertainty in in retrieved QEUV ParameterKey qeuv_unc_ran Description Model uncertainty in retrieved QEUV. Cadence PT8S Units erg/cm2/s Structure Size 92 40 ValidMin 0 ValidMax 10 FillValue 9.9692e+36 Support Qualifier Uncertainty SupportQuantity Other Parameter #24 Name Mask Defining LBH Bandpass ParameterKey mask_n2_lbh Description Wavelength mask defining LBH bandpass used in retrieval. Cadence PT8S Structure Size 4001 ValidMin 0 ValidMax 1 FillValue -2147483647 Support SupportQuantity Other Parameter #25 Name Pixel Emission Angle ParameterKey emission_angle Description Emission angle (relative to zenith). Cadence PT8S Units degrees Structure Size 92 40 ValidMin 0 ValidMax 90 FillValue 9.9692e+36 Support Qualifier Direction SupportQuantity Positional Parameter #26 Name O/N2 Filename Lookup Table ParameterKey on2_lookup_table Description ON2 lookup table filename. Cadence PT8S Structure Size 50 40 Support SupportQuantity Other Parameter #27 Name Scan Stop Time ParameterKey scan_stop_time Description UTC stop time of scan, e.g., "2017-06-21T23:46:38.015Z". Cadence PT8S Units date/time Structure Size 50 40 FillValue ' ' Support Qualifier Magnitude SupportQuantity Temporal Parameter #28 Name Systematic Uncertainty in Oxygen 135.6 nm Brightness ParameterKey oi_1356_unc_sys Description Systematic uncertainty in oxygen 135.6 nm brightness. Cadence PT8S Units Rayleighs Structure Size 92 40 ValidMin 0 ValidMax 100000 FillValue 9.9692e+36 Wave WaveType Photon Qualifier Uncertainty WaveQuantity Intensity Parameter #29 Name Mask Wavelength ParameterKey mask_wavelength Description Wavelength grid for 1356 mask. Cadence PT8S Units nm Structure Size 4001 ValidMin 130 ValidMax 170 FillValue 9.9692e+36 Wave WaveType Photon Qualifier Scalar WaveQuantity Wavelength