{
  "id": "GOLD_L2_ON2",
  "url": "http://hpde.io/NASA/NumericalData/GOLD/L2/ON2/PT8S",
  "data-file": "./data/spase_hpde_io/info/GOLD_L2_ON2.json",
  "data": {
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        "ResourceID": "spase://NASA/NumericalData/GOLD/L2/ON2/PT8S",
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        "ResourceHeader": {
          "ResourceName": "Gold Level L2 ratio of the column abundance of thermospheric O relative to N2",
          "DOI": "https://doi.org/10.48322/wjrk-dk56",
          "ReleaseDate": "2025-12-04T13:29:18Z",
          "RevisionHistory": {
            "RevisionEvent": [
              {
                "ReleaseDate": "2020-09-14T16:47:17",
                "Note": "Only known prior ReleaseDate of the metadata"
              },
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                "ReleaseDate": "2023-10-09T12:34:56.789",
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                "ReleaseDate": "2025-11-03T12:34:56.789",
                "Note": "Contacts and text revised. JMW"
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          },
          "Description": "GOLD daytime disk scan (DAY) measurements are used to derive the ratio of the column abundance of thermospheric O relative to N2, conventionally referred to as O/N2 or ΣO/N2, but abbreviated to ON2 for the GOLD data product. ON2 is derived from dayside Level 1C data after binning pixels 2x2 for approximately 68 disk scan measurements performed per day by GOLD in nominal operation.\n\nAlgorithm heritage\n\nThe disk ON2 retrieval algorithm was originally developed by Computational Physics, Inc. (CPI) for use with GUVI and SSUSI radiance 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 over the past several decades (e.g., Evans et al. [1995]; Christensen et al. [2003]; Strickland et al. [2004]) and Correira et al. [2021] describe the implementation used for the GOLD data.\n\nAlgorithm theoretical basis\n\nThe geophysical parameter retrieved, O/N2, is the ratio of the vertical column density of O relative to N2, defined at a standard reference N2 depth of 1017 cm-2, which is chosen to minimize uncertainty in the derived O/N2. It is retrieved directly from the ratio of the O I 135.6 nm and N2 LBH band intensities measured by GOLD on the dayside disk (DAY measurement mode). The AURIC atmospheric radiance model (Strickland et al. [1999]) is used to derive this relationship as a function of solar zenith angle and to create the look-up table (LUT) used by the algorithm.\n\nReferences\n\nChristensen, A. B., et al. (2003), Initial observations with the Global Ultraviolet Imager (GUVI) in the NASA TIMED satellite mission, J. Geophys. Res., vol. 108, NO. A12, 1451, doi:10.1029/2003JA009918.\n\nCorreira, J., Evans, J. S., Lumpe, J. D., Krywonos, A., Daniell, R., Veibell, V., et al. (2021). Thermospheric composition and solar EUV flux from the Globalscale Observations of the Limb and Disk (GOLD) mission. Journal of Geophysical Research: Space Physics, 126, e2021JA029517. https://doi.org/10.1029/2021JA029517 \n\nEvans, 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.\n\nStrickland, D. J., R. R. Meier, R. L. Walterscheid, J. D. Craven, A. B. Christensen, L. J. Paxton, D. Morrison, and G. Crowley (2004), Quiet-time seasonal behavior of the thermosphere seen in the far ultraviolet dayglow, J. Geophys. Res., vol. 109, A01302, doi:10.1029/2003JA010220.\n\nStrickland, D.J., J. Bishop, J.S. Evans, T. Majeed, P.M. Shen, R.J. Cox, R. Link, and R.E. Huffman (1999), Atmospheric Ultraviolet Radiance Integrated Code (AURIC): theory, software architecture, inputs and selected results, JQSRT, 62, 689-742.\n\nStrickland, 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.",
          "Acknowledgement": "National Aeronautics and Space Administration; Dr. Richard Eastes",
          "PublicationInfo": {
            "Authors": "Eastes, Richard; Daniell, Robert E.",
            "PublicationDate": "2025-11-14T16:03:02Z",
            "PublishedBy": "Space Physics Data Facility"
          },
          "Contact": [
            {
              "PersonID": "spase://SMWG/Person/Richard.Eastes",
              "Role": "PrincipalInvestigator"
            },
            {
              "PersonID": "spase://SMWG/Person/Robert.E.Daniell",
              "Role": "CoInvestigator"
            },
            {
              "PersonID": "spase://SMWG/Person/Andrey.Krywonos",
              "Role": "ProjectManager"
            },
            {
              "PersonID": "spase://SMWG/Person/James.M.Weygand",
              "Role": "MetadataContact"
            }
          ],
          "InformationURL": [
            {
              "Name": "GOLD Homepage web page",
              "URL": "https://gold.cs.ucf.edu/",
              "Description": "GOLD web page with news and other information"
            },
            {
              "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."
            }
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              "Name": "FTPS from SPDF (not with most browsers)",
              "URL": "ftps://spdf.gsfc.nasa.gov/pub/data/gold/level2/on2/",
              "ProductKey": "GOLD_L2_ON2",
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            "Acknowledgement": "Space Physics Data Facility of the NASA Goddard Space Flight Center; Robert M. Candey"
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            "AccessURL": {
              "Name": "CDAWeb",
              "URL": "https://cdaweb.gsfc.nasa.gov/cgi-bin/eval2.cgi?dataset=GOLD_L2_ON2&index=sp_phys",
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            "Format": "CSV",
            "Acknowledgement": "Space Physics Data Facility of the NASA Goddard Space Flight Center; Robert M. Candey"
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        ],
        "ProcessingLevel": "Calibrated",
        "ProviderName": "GOLD",
        "ProviderResourceName": "Gold Level L2 Molecular Oxygen Density Profile",
        "ProviderProcessingLevel": "Level 2",
        "ProviderVersion": "1",
        "InstrumentID": "spase://SMWG/Instrument/GOLD",
        "MeasurementType": "ImageIntensity",
        "TemporalDescription": {
          "TimeSpan": {
            "StartDate": "2018-10-06T00:00:00",
            "RelativeStopDate": "P1D"
          },
          "Cadence": "PT8S"
        },
        "ObservedRegion": "Earth.NearSurface.Ionosphere",
        "Keyword": [
          "O relative to N2",
          "GOLD",
          "SES-14"
        ],
        "Parameter": {
          "mask_oi_1356": {
            "Name": "Mask Defining OI 1356 Bandpass",
            "ParameterKey": "mask_oi_1356",
            "Description": "Wavelength mask defining OI 1356 bandpass used in retrieval",
            "Cadence": "PT8S",
            "ValidMin": "0",
            "ValidMax": "1",
            "FillValue": "-2147483647",
            "Support": {
              "SupportQuantity": "Other"
            }
          },
          "n2_lbh_unc_ran": {
            "Name": "Random Uncertainty in N2 LBH",
            "ParameterKey": "n2_lbh_unc_ran",
            "Description": "Random uncertainty in N2 LBH brightness",
            "Cadence": "PT8S",
            "Units": "Rayleighs",
            "ValidMin": "0",
            "ValidMax": "100000",
            "FillValue": "9.9692e+36",
            "Wave": {
              "WaveType": "Photon",
              "Qualifier": "Uncertainty",
              "WaveQuantity": "Intensity"
            }
          },
          "lookup_table": {
            "Name": "Lookup Table",
            "ParameterKey": "lookup_table",
            "Description": "Lookup table filename",
            "Cadence": "PT8S",
            "Support": {
              "SupportQuantity": "Other"
            }
          },
          "mask_wavelength": {
            "Name": "Mask Wavelength",
            "ParameterKey": "mask_wavelength",
            "Description": "Wavelength grid for MASK_N2_LBH and MASK_OI_1356",
            "Cadence": "PT8S",
            "Units": "nm",
            "ValidMin": "130",
            "ValidMax": "170",
            "FillValue": "9.9692e+36",
            "Wave": {
              "WaveType": "Photon",
              "Qualifier": "Scalar",
              "WaveQuantity": "Wavelength"
            }
          },
          "radiance_oi_1356": {
            "Name": "OI 1356 brightness",
            "ParameterKey": "radiance_oi_1356",
            "Description": "OI 1356 brightness used in retrieval",
            "Cadence": "PT8S",
            "Units": "nm",
            "ValidMin": "0",
            "ValidMax": "100000",
            "FillValue": "9.9692e+36",
            "Wave": {
              "WaveType": "Photon",
              "Qualifier": "Scalar",
              "WaveQuantity": "Intensity"
            }
          },
          "channel": {
            "Name": "GOLD channel",
            "ParameterKey": "channel",
            "Description": "GOLD channel ('A' or 'B')",
            "Cadence": "PT8S",
            "Support": {
              "Qualifier": "Scalar",
              "SupportQuantity": "Other"
            }
          },
          "latitude": {
            "Name": "Latitude",
            "ParameterKey": "latitude",
            "Description": "Pixel latitude",
            "Cadence": "PT8S",
            "Units": "degrees",
            "ValidMin": "-90",
            "ValidMax": "90",
            "FillValue": "9.9692e+36",
            "Support": {
              "Qualifier": "Direction",
              "SupportQuantity": "Positional"
            }
          },
          "on2": {
            "Name": "Retrieved O/N2 column density ratio",
            "ParameterKey": "on2",
            "Description": "Retrieved O/N2 column density ratio used in QEUV retrieval",
            "Cadence": "PT8S",
            "ValidMin": "0",
            "ValidMax": "5",
            "FillValue": "9.9692e+36",
            "Mixed": {
              "MixedQuantity": "Other",
              "Qualifier": "Ratio"
            }
          },
          "oi_1356_unc_ran": {
            "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",
            "ValidMin": "0",
            "ValidMax": "100000",
            "FillValue": "9.9692e+36",
            "Wave": {
              "WaveType": "Photon",
              "Qualifier": "Uncertainty",
              "WaveQuantity": "Intensity"
            }
          },
          "on2_unc_ran": {
            "Name": "Random Uncertainty in O/N2 Ratio",
            "ParameterKey": "on2_unc_ran",
            "Description": "Random uncertainty in retrieved O/N2 column density ratio",
            "Cadence": "PT8S",
            "ValidMin": "0",
            "ValidMax": "100000",
            "FillValue": "9.9692e+36",
            "Support": {
              "Qualifier": "Uncertainty",
              "SupportQuantity": "Other"
            }
          },
          "dqi": {
            "Name": "Overall Quality Flag",
            "ParameterKey": "dqi",
            "Description": "NMAX data quality index (see table below)",
            "Cadence": "PT8S",
            "ValidMin": "0",
            "ValidMax": "2147483647",
            "FillValue": "-2147483647",
            "Support": {
              "Qualifier": "Scalar",
              "SupportQuantity": "Other"
            }
          },
          "scan_start_time": {
            "Name": "Scan Start Time",
            "ParameterKey": "scan_start_time",
            "Description": "UTC start time of scan, e.g., 2017-06-21T23:46:38.015Z",
            "Cadence": "PT8S",
            "Units": "date/time",
            "FillValue": "' '",
            "Support": {
              "Qualifier": "Magnitude",
              "SupportQuantity": "Temporal"
            }
          },
          "solar_zenith_angle": {
            "Name": "Solar Zenith Angle at 225 km",
            "ParameterKey": "solar_zenith_angle",
            "Description": "Solar zenith angle at 225 km tangent point",
            "Cadence": "PT8S",
            "Units": "degrees",
            "ValidMin": "0",
            "ValidMax": "180",
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            "Support": {
              "Qualifier": "Direction",
              "SupportQuantity": "Positional"
            }
          },
          "longitude": {
            "Name": "Longitude",
            "ParameterKey": "longitude",
            "Description": "Pixel longitude",
            "Cadence": "PT8S",
            "Units": "degrees",
            "ValidMin": "-180",
            "ValidMax": "180",
            "FillValue": "9.9692e+36",
            "Support": {
              "Qualifier": "Direction",
              "SupportQuantity": "Positional"
            }
          },
          "on2_dqi": {
            "Name": "O/N2 Ratio Quality Flag",
            "ParameterKey": "on2_dqi",
            "Description": "ON2 data quality index per pixel (see table below)",
            "Cadence": "PT8S",
            "ValidMin": "0",
            "ValidMax": "2147483647",
            "FillValue": "-2147483647",
            "Support": {
              "Qualifier": "Scalar",
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            }
          },
          "on2_unc_sys": {
            "Name": "Systematic Uncertainty in O/N2 Ratio",
            "ParameterKey": "on2_unc_sys",
            "Description": "Systematic uncertainty in retrieved O/N2 column density ratio",
            "Cadence": "PT8S",
            "ValidMin": "0",
            "ValidMax": "5",
            "FillValue": "9.9692e+36",
            "Support": {
              "Qualifier": "Uncertainty",
              "SupportQuantity": "Other"
            }
          },
          "on2_unc_mod": {
            "Name": "Model Uncertainty in O/N2 Ratio",
            "ParameterKey": "on2_unc_mod",
            "Description": "Model uncertainty in retrieved O/N2 column density ratio",
            "Cadence": "PT8S",
            "ValidMin": "0",
            "ValidMax": "5",
            "FillValue": "9.9692e+36",
            "Support": {
              "Qualifier": "Uncertainty",
              "SupportQuantity": "Other"
            }
          },
          "n2_lbh_unc_sys": {
            "Name": "Systematic Uncertainty in N2 LBH brightness",
            "ParameterKey": "n2_lbh_unc_sys",
            "Description": "Systematic uncertainty in N2 LBH brightness",
            "Cadence": "PT8S",
            "Units": "Rayleighs",
            "ValidMin": "0",
            "ValidMax": "100000",
            "FillValue": "9.9692e+36",
            "Support": {
              "Qualifier": "Uncertainty",
              "SupportQuantity": "Other"
            }
          },
          "time_utc": {
            "Name": "UTC time",
            "ParameterKey": "time_utc",
            "Description": "UTC date/time string: 2017-06-21T23:46:38.015Z",
            "Cadence": "PT8S",
            "Units": "date/time",
            "FillValue": "' '",
            "Support": {
              "Qualifier": "Magnitude",
              "SupportQuantity": "Temporal"
            }
          },
          "mask_n2_lbh": {
            "Name": "Mask Defining LBH Bandpass",
            "ParameterKey": "mask_n2_lbh",
            "Description": "Wavelength mask defining LBH bandpass used in retrieval",
            "Cadence": "PT8S",
            "ValidMin": "0",
            "ValidMax": "1",
            "FillValue": "-2147483647",
            "Support": {
              "SupportQuantity": "Other"
            }
          },
          "input_l1c_file": {
            "Name": "L1C File Name",
            "ParameterKey": "input_l1c_file",
            "Description": "L1C file name for each occultation",
            "Cadence": "PT8S",
            "FillValue": "' '",
            "Support": {
              "Qualifier": "Scalar",
              "SupportQuantity": "Other"
            }
          },
          "radiance_n2_lbh": {
            "Name": "N2 LBH brightness",
            "ParameterKey": "radiance_n2_lbh",
            "Description": "N2 LBH brightness used in retrieval",
            "Cadence": "PT8S",
            "Units": "nm",
            "ValidMin": "0",
            "ValidMax": "100000",
            "FillValue": "9.9692e+36",
            "Wave": {
              "WaveType": "Photon",
              "Qualifier": "Scalar",
              "WaveQuantity": "Intensity"
            }
          },
          "emission_angle": {
            "Name": "Pixel Emission Angle",
            "ParameterKey": "emission_angle",
            "Description": "Pixel emission angle (relative to zenith)",
            "Cadence": "PT8S",
            "Units": "degrees",
            "ValidMin": "0",
            "ValidMax": "90",
            "FillValue": "9.9692e+36",
            "Support": {
              "Qualifier": "Direction",
              "SupportQuantity": "Positional"
            }
          },
          "scan_stop_time": {
            "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",
            "FillValue": "' '",
            "Support": {
              "Qualifier": "Magnitude",
              "SupportQuantity": "Temporal"
            }
          },
          "oi_1356_unc_sys": {
            "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",
            "ValidMin": "0",
            "ValidMax": "100000",
            "FillValue": "9.9692e+36",
            "Wave": {
              "WaveType": "Photon",
              "Qualifier": "Uncertainty",
              "WaveQuantity": "Intensity"
            }
          },
          "hemisphere": {
            "Name": "Hemisphere Scanned",
            "ParameterKey": "hemisphere",
            "Description": "Hemisphere scanned ('N' or 'S')",
            "Cadence": "PT8S",
            "FillValue": "' '",
            "Support": {
              "Qualifier": "Scalar",
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}