{
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        "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"
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    },
    "Collection": {
      "ResourceID": "spase://NASA/Collection/ISIS2/SFS/Ionogram/PT22S",
      "NamingAuthority": "NASA",
      "ResourceType": "Collection",
      "ResourceHeader": {
        "ResourceName": "ISIS 2 Topside Sounder Ionograms",
        "AlternateName": "ISIS-2 Topside Sounder Ionogram CDFs at NASA's CDAWeb",
        "DOI": "https://doi.org/10.48322/v11k-e045",
        "ReleaseDate": "2026-02-12T23:08:33Z",
        "RevisionHistory": {
          "RevisionEvent": {
            "ReleaseDate": "2026-05-15T13:29:41Z",
            "Note": "ISIS 2 Collection metadata of ionograms created. JMW"
          }
        },
        "Description": "These ionograms were digitized from the original ISIS-2 7-track analog telemetry tapes using the facilities of the former Data Evaluation Laboratory at the NASA/GSFC. This data restoration project is headed by Dr. R.F. Benson (NASA/GSFC). Ionograms were digitized at the rate of 40,000 16-bit samples/sec. This sample rate is higher than the Nyquist frequency of 30 kHz. The sample frequency of 40 kHz provides a measurement every 25 microseconds corresponding to an apparent range (c*t/2) interval of 3.75 km. Ionograms with this sample rate are designated as \"full\" ionograms because they have the full 3.75 km apparent-range resolution. The ionograms used for most analysis, and those available from CDAWeb, were produced by averaging every four samples of the sounder-receiver video amplitude output to yield an average value every 100 microseconds corresponding to an apparent-range resolution of 15 km. These ionogram files are referred to as \"average\" files with standard resolution. Each ionogram consists of a fixed-frequency and and a swept-frequency portion. The time resolution between ionograms is typically 14 or 22 seconds depending on the frequency sweep range.",
        "Acknowledgement": "Users please acknowledge the Coordinated Data Analysis Web (CDAWeb) at the NASA Goddard Space Flight Center, ISIS-2 SFS instrument Principal Investigator J. H. Whitteker and ISIS Data-Restoration project lead Robert F. Benson.",
        "PublicationInfo": {
          "Authors": "Whitteker, James H.",
          "PublicationDate": "2025-11-14T16:02:30Z",
          "PublishedBy": "Space Physics Data Facility"
        },
        "Contact": [
          {
            "PersonID": "spase://SMWG/Person/James.H.Whitteker",
            "Role": "PrincipalInvestigator"
          },
          {
            "PersonID": "spase://SMWG/Person/Robert.F.Benson",
            "Role": "GeneralContact"
          },
          {
            "PersonID": "spase://SMWG/Person/Dieter.K.Bilitza",
            "Role": "GeneralContact"
          }
        ],
        "InformationURL": [
          {
            "Name": "ISIS/Alouette Topside Sounder Data Restoration Project",
            "URL": "https://nssdc.gsfc.nasa.gov/space/isis/isis-status.html",
            "Description": "ISIS/Alouette page maintained by NASA GSFC with science and instrument descriptions, data access, software, and publication lists",
            "Language": "en"
          },
          {
            "Name": "NSSDC's Master Catalog",
            "URL": "https://nssdc.gsfc.nasa.gov/nmc/experiment/display.action?id=1971-024A-01",
            "Description": "Information about the Sweep Frequency Sounder experiment on ISIS-2."
          }
        ],
        "PriorID": [
          "spase://VWO/NumericalData/ISIS2/SFS/ISIS2_Ionogram_CDF_PT22S",
          "spase://VWO/NumericalData/ISIS2/SFS/Ionogram.PT22S",
          "spase://VSPO/NumericalData/ISIS2/SFS/Ionogram/PT22S"
        ]
      },
      "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": "HTTPS from SPDF",
            "URL": "https://spdf.gsfc.nasa.gov/pub/data/isis/topside_sounder/ionogram_cdf/isis2/",
            "Description": "HTTPS access to repository of ISIS-2 Ionograms in CDF format at NASA CDAWeb",
            "Language": "en"
          },
          {
            "Name": "Subset, plot, list from CDAWeb",
            "URL": "https://cdaweb.gsfc.nasa.gov/sp_phys/",
            "Description": "CDAWeb interactive interface for subsets, plots and lists of data"
          }
        ],
        "Format": "CDF",
        "Encoding": "None",
        "Acknowledgement": "Please acknowledge the CDAWeb team at NASA/GSFC/SPDF"
      },
      "Member": [
        {
          "ResourceName": "ISIS-2 Topside Sounder Average Ionogram over Ahmedabad, India: AME, Latitude 23, Longitude 73",
          "Description": "These Ionograms were digitized from the original ISIS-2 7-Track Analog Telemetry Tapes using the Facilities of the former Data Evaluation Laboratory at the NASA/GSFC.",
          "MemberID": "spase://NASA/NumericalData/ISIS2/SFS/AverageIonogram/Ahmedabad/PT22S",
          "StartDate": "1973-02-03T04:00:26Z",
          "StopDate": "1978-01-23T07:28:43Z",
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            "CenterLatitude": "23",
            "CenterLongitude": "73"
          }
        },
        {
          "ResourceName": "ISIS-2 Topside Sounder Average Ionogram over Ascension Island, United Kingdom: ACN, Latitude -8, Longitude 346",
          "Description": "These Ionograms were digitized from the original ISIS-2 7-Track Analog Telemetry Tapes using the Facilities of the former Data Evaluation Laboratory at the NASA/GSFC.",
          "MemberID": "spase://NASA/NumericalData/ISIS2/SFS/AverageIonogram/AscensionIsland/PT22S",
          "StartDate": "1975-01-09T01:22:59Z",
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            },
            "CenterLatitude": "-8",
            "CenterLongitude": "346"
          }
        },
        {
          "ResourceName": "ISIS-2 Topside Sounder Average Ionogram over Brazzavillle, Congo: BRZ, Latitude -4, Longitude 15 ",
          "Description": "These Ionograms were digitized from the original ISIS-2 7-Track Analog Telemetry Tapes using the Facilities of the former Data Evaluation Laboratory at the NASA/GSFC.",
          "MemberID": "spase://NASA/NumericalData/ISIS2/SFS/AverageIonogram/Brazzaville/PT22S",
          "StartDate": "1972-08-05T16:17:40Z",
          "StopDate": "1975-09-25T16:12:59Z",
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            },
            "CenterLatitude": "-4",
            "CenterLongitude": "15"
          }
        },
        {
          "ResourceName": "ISIS-2 Topside Sounder Average Ionogram over Fairbanks, AK: ULA, Latitude 65, Longitude 212",
          "Description": "These Ionograms were digitized from the original ISIS-2 7-Track Analog Telemetry Tapes using the Facilities of the former Data Evaluation Laboratory at the NASA/GSFC.",
          "MemberID": "spase://NASA/NumericalData/ISIS2/SFS/AverageIonogram/Fairbanks/PT22S",
          "StartDate": "1972-12-31T00:00:00Z",
          "StopDate": "1979-07-30T02:17:45Z",
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            "CenterLatitude": "65",
            "CenterLongitude": "212"
          }
        },
        {
          "ResourceName": "ISIS-2 Topside Sounder Average Ionogram over Falkland Island, United Kingdom: SOL, Latitude -52, Longitude 302 ",
          "Description": "These Ionograms were digitized from the original ISIS-2 7-Track Analog Telemetry Tapes using the Facilities of the former Data Evaluation Laboratory at the NASA/GSFC.",
          "MemberID": "spase://NASA/NumericalData/ISIS2/SFS/AverageIonogram/FalklandIslands/PT22S",
          "StartDate": "1972-01-12T16:31:05Z",
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            "CenterLatitude": "-52",
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          }
        },
        {
          "ResourceName": "ISIS-2 Topside Sounder Average Ionogram over Johannesburg, South Africa: BUR, Latitude -26, Longitude 28 ",
          "Description": "These Ionograms were digitized from the original ISIS-2 7-Track Analog Telemetry Tapes using the Facilities of the former Data Evaluation Laboratory at the NASA/GSFC.",
          "MemberID": "spase://NASA/NumericalData/ISIS2/SFS/AverageIonogram/Johannesburg/PT22S",
          "StartDate": "1972-08-07T15:26:03Z",
          "StopDate": "1976-01-16T19:18:39Z",
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            },
            "CenterLatitude": "-26",
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          }
        },
        {
          "ResourceName": "ISIS-2 Topside Sounder Average Ionogram over Kashima, Japan: KSH, Latitude 36, Longitude 141",
          "Description": "These Ionograms were digitized from the original ISIS-2 7-Track Analog Telemetry Tapes using the Facilities of the former Data Evaluation Laboratory at the NASA/GSFC.",
          "MemberID": "spase://NASA/NumericalData/ISIS2/SFS/AverageIonogram/Kashima/PT22S",
          "StartDate": "1972-01-01T00:01:10Z",
          "StopDate": "1984-01-06T14:08:01Z",
          "SpatialCoverage": {
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            },
            "CenterLatitude": "36",
            "CenterLongitude": "141"
          }
        },
        {
          "ResourceName": "ISIS-2 Topside Sounder Average Ionogram over Kerguelen Island, France: KER, Latitude -49, Longitude 70",
          "Description": "These Ionograms were digitized from the original ISIS-2 7-Track Analog Telemetry Tapes using the Facilities of the former Data Evaluation Laboratory at the NASA/GSFC.",
          "MemberID": "spase://NASA/NumericalData/ISIS2/SFS/AverageIonogram/KerguelenIsland/PT22S",
          "StartDate": "1977-01-01T00:01:37Z",
          "StopDate": "1984-01-27T18:16:53Z",
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            },
            "CenterLatitude": "-49",
            "CenterLongitude": "70"
          }
        },
        {
          "ResourceName": "ISIS-2 Topside Sounder Average Ionogram over Kourou, French Guyana: KRU, Latitude 5, Longitude 307",
          "Description": "These Ionograms were digitized from the original ISIS-2 7-Track Analog Telemetry Tapes using the Facilities of the former Data Evaluation Laboratory at the NASA/GSFC.",
          "MemberID": "spase://NASA/NumericalData/ISIS2/SFS/AverageIonogram/Kourou/PT22S",
          "StartDate": "1973-02-06T01:16:08Z",
          "StopDate": "1978-07-23T22:07:30Z",
          "SpatialCoverage": {
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            },
            "CenterLatitude": "5",
            "CenterLongitude": "307"
          }
        },
        {
          "ResourceName": "ISIS-2 Topside Sounder Average Ionogram over Kwajalein, Marshall Islands: KWA, Latitude 9, Longitude 168",
          "Description": "These Ionograms were digitized from the original ISIS-2 7-Track Analog Telemetry Tapes using the Facilities of the former Data Evaluation Laboratory at the NASA/GSFC.",
          "MemberID": "spase://NASA/NumericalData/ISIS2/SFS/AverageIonogram/Kwajalein/PT22S",
          "StartDate": "1978-01-10T08:46:53Z",
          "StopDate": "1978-11-09T07:38:18Z",
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            },
            "CenterLatitude": "9",
            "CenterLongitude": "168"
          }
        },
        {
          "ResourceName": "ISIS-2 Topside Sounder Average Ionogram over Las Palmas, Canary Island, Spain: CNA, Latitude 28, Longitude 345",
          "Description": "These Ionograms were digitized from the original ISIS-2 7-Track Analog Telemetry Tapes using the Facilities of the former Data Evaluation Laboratory at the NASA/GSFC.",
          "MemberID": "spase://NASA/NumericalData/ISIS2/SFS/AverageIonogram/LasPalmas/PT22S",
          "StartDate": "1974-01-16T17:42:39Z",
          "StopDate": "1976-02-01T11:15:40Z",
          "SpatialCoverage": {
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            },
            "CenterLatitude": "28",
            "CenterLongitude": "345"
          }
        },
        {
          "ResourceName": "ISIS-2 Topside Sounder Average Ionogram over Lauder, New Zealand: LAU, Latitude -45, Longitude 170",
          "Description": "These Ionograms were digitized from the original ISIS-2 7-Track Analog Telemetry Tapes using the Facilities of the former Data Evaluation Laboratory at the NASA/GSFC.",
          "MemberID": "spase://NASA/NumericalData/ISIS2/SFS/AverageIonogram/Lauder/PT22S",
          "StartDate": "1973-01-01T04:14:29Z",
          "StopDate": "1981-01-18T15:47:50Z",
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            "CoordinateSystem": {
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            },
            "CenterLatitude": "-45",
            "CenterLongitude": "170"
          }
        },
        {
          "ResourceName": "ISIS-2 Topside Sounder Average Ionogram over Orroral, Australia: ORR, Latitude -36, Longitude 149",
          "Description": "These Ionograms were digitized from the original ISIS-2 7-Track Analog Telemetry Tapes using the Facilities of the former Data Evaluation Laboratory at the NASA/GSFC.",
          "MemberID": "spase://NASA/NumericalData/ISIS2/SFS/AverageIonogram/Orroral/PT22S",
          "StartDate": "1973-03-15T03:33:11Z",
          "StopDate": "1981-07-20T20:42:22Z",
          "SpatialCoverage": {
            "CoordinateSystem": {
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            },
            "CenterLatitude": "-36",
            "CenterLongitude": "149"
          }
        },
        {
          "ResourceName": "ISIS-2 Topside Sounder Average Ionogram over Ottawa, QC, Canada: OTT, Latitude 45, Longitude 284",
          "Description": "These Ionograms were digitized from the original ISIS-2 7-Track Analog Telemetry Tapes using the Facilities of the former Data Evaluation Laboratory at the NASA/GSFC.",
          "MemberID": "spase://NASA/NumericalData/ISIS2/SFS/AverageIonogram/Ottawa/PT22S",
          "StartDate": "1971-11-11T18:18:16Z",
          "StopDate": "1984-01-04T05:16:00Z",
          "SpatialCoverage": {
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              "CoordinateSystemName": "GEO"
            },
            "CenterLatitude": "45",
            "CenterLongitude": "284"
          }
        },
        {
          "ResourceName": "ISIS-2 Topside Sounder Average Ionogram over Ouagadougou, Burkina Faso: ODG, Latitude 14, Longitude 359",
          "Description": "These Ionograms were digitized from the original ISIS-2 7-Track Analog Telemetry Tapes using the Facilities of the former Data Evaluation Laboratory at the NASA/GSFC.",
          "MemberID": "spase://NASA/NumericalData/ISIS2/SFS/AverageIonogram/Ouagadougou/PT22S",
          "StartDate": "1972-08-06T05:36:37Z",
          "StopDate": "1979-11-22T15:25:12Z",
          "SpatialCoverage": {
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            },
            "CenterLatitude": "14",
            "CenterLongitude": "359"
          }
        },
        {
          "ResourceName": "ISIS-2 Topside Sounder Average Ionogram over Quito, Equador: QUI, Latitude -1, Longitude 281",
          "Description": "These Ionograms were digitized from the original ISIS-2 7-Track Analog Telemetry Tapes using the Facilities of the former Data Evaluation Laboratory at the NASA/GSFC.",
          "MemberID": "spase://NASA/NumericalData/ISIS2/SFS/AverageIonogram/Quito/PT22S",
          "StartDate": "1973-01-03T02:22:10Z",
          "StopDate": "1979-10-18T04:22:30Z",
          "SpatialCoverage": {
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            },
            "CenterLatitude": "-1",
            "CenterLongitude": "281"
          }
        },
        {
          "ResourceName": "ISIS-2 Topside Sounder Average Ionogram over Resolute Bay, NU, Canada: RES, Latitude 75, Longitude 265",
          "Description": "These Ionograms were digitized from the original ISIS-2 7-Track Analog Telemetry Tapes using the Facilities of the former Data Evaluation Laboratory at the NASA/GSFC.",
          "MemberID": "spase://NASA/NumericalData/ISIS2/SFS/AverageIonogram/ResoluteBay/PT22S",
          "StartDate": "1971-04-01T09:22:52Z",
          "StopDate": "1983-01-13T11:06:43Z",
          "SpatialCoverage": {
            "CoordinateSystem": {
              "CoordinateRepresentation": "Spherical",
              "CoordinateSystemName": "GEO"
            },
            "CenterLatitude": "75",
            "CenterLongitude": "265"
          }
        },
        {
          "ResourceName": "ISIS-2 Topside Sounder Average Ionogram over Santiago, Chile: SNT, Latitude -33, Longitude 298",
          "Description": "These Ionograms were digitized from the original ISIS-2 7-Track Analog Telemetry Tapes using the Facilities of the former Data Evaluation Laboratory at the NASA/GSFC.",
          "MemberID": "spase://NASA/NumericalData/ISIS2/SFS/AverageIonogram/Santiago/PT22S",
          "StartDate": "1973-06-15T09:48:17Z",
          "StopDate": "1980-03-21T09:09:03Z",
          "SpatialCoverage": {
            "CoordinateSystem": {
              "CoordinateRepresentation": "Spherical",
              "CoordinateSystemName": "GEO"
            },
            "CenterLatitude": "-33",
            "CenterLongitude": "298"
          }
        },
        {
          "ResourceName": "ISIS-2 Topside Sounder Average Ionogram over Sodankyla, Finland: SOD, Latitude 67, Longitude 27",
          "Description": "These Ionograms were digitized from the original ISIS-2 7-Track Analog Telemetry Tapes using the Facilities of the former Data Evaluation Laboratory at the NASA/GSFC.",
          "MemberID": "spase://NASA/NumericalData/ISIS2/SFS/AverageIonogram/Sodankyla/PT22S",
          "StartDate": "1977-12-11T21:47:50Z",
          "StopDate": "1978-09-13T21:01:48Z",
          "SpatialCoverage": {
            "CoordinateSystem": {
              "CoordinateRepresentation": "Spherical",
              "CoordinateSystemName": "GEO"
            },
            "CenterLatitude": "67",
            "CenterLongitude": "27"
          }
        },
        {
          "ResourceName": "ISIS-2 Topside Sounder Average Ionogram over Syowa Base, Antartica: SYO, Latitude -69, Longitude 40",
          "Description": "These Ionograms were digitized from the original ISIS-2 7-Track Analog Telemetry Tapes using the Facilities of the former Data Evaluation Laboratory at the NASA/GSFC.",
          "MemberID": "spase://NASA/NumericalData/ISIS2/SFS/AverageIonogram/SyowaBase/PT22S",
          "StartDate": "1973-02-03T05:49:37Z",
          "StopDate": "1983-01-13T11:06:43Z",
          "SpatialCoverage": {
            "CoordinateSystem": {
              "CoordinateRepresentation": "Spherical",
              "CoordinateSystemName": "GEO"
            },
            "CenterLatitude": "-69",
            "CenterLongitude": "40"
          }
        },
        {
          "ResourceName": "ISIS-2 Topside Sounder Average Ionogram over Terre Adelie, Antarctica: ADL, Latitude -67, Longitude 140",
          "Description": "These Ionograms were digitized from the original ISIS-2 7-Track Analog Telemetry Tapes using the Facilities of the former Data Evaluation Laboratory at the NASA/GSFC.",
          "MemberID": "spase://NASA/NumericalData/ISIS2/SFS/AverageIonogram/TerreAdelie/PT22S",
          "StartDate": "1973-01-12T10:18:21Z",
          "StopDate": "1983-02-03T18:47:56Z",
          "SpatialCoverage": {
            "CoordinateSystem": {
              "CoordinateRepresentation": "Spherical",
              "CoordinateSystemName": "GEO"
            },
            "CenterLatitude": "-67",
            "CenterLongitude": "140"
          }
        },
        {
          "ResourceName": "ISIS-2 Topside Sounder Average Ionogram over Tromso, Norway: TRO, Latitude 70, Longitude 19",
          "Description": "These Ionograms were digitized from the original ISIS-2 7-Track Analog Telemetry Tapes using the Facilities of the former Data Evaluation Laboratory at the NASA/GSFC.",
          "MemberID": "spase://NASA/NumericalData/ISIS2/SFS/AverageIonogram/Tromso/PT22S",
          "StartDate": "1973-01-19T10:38:36Z",
          "StopDate": "1977-10-06T20:20:00Z",
          "SpatialCoverage": {
            "CoordinateSystem": {
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              "CoordinateSystemName": "GEO"
            },
            "CenterLatitude": "70",
            "CenterLongitude": "19"
          }
        },
        {
          "ResourceName": "ISIS-2 Topside Sounder Average Ionogram over Winkfield, United Kingdom: WNK, Latitude 51, Longitude 359",
          "Description": "These Ionograms were digitized from the original ISIS-2 7-Track Analog Telemetry Tapes using the Facilities of the former Data Evaluation Laboratory at the NASA/GSFC.",
          "MemberID": "spase://NASA/NumericalData/ISIS2/SFS/AverageIonogram/Winkfield/PT22S",
          "StartDate": "1973-03-14T11:55:35Z",
          "StopDate": "1979-07-15T04:35:11Z",
          "SpatialCoverage": {
            "CoordinateSystem": {
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              "CoordinateSystemName": "GEO"
            },
            "CenterLatitude": "51",
            "CenterLongitude": "359"
          }
        }
      ]
    }
  }
}