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        "RightsURI": "https://spdx.org/licenses/CC0-1.0.html",
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      "NamingAuthority": "NASA",
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        "ResourceName": "ISIS 1 Topside Sounder Ionograms",
        "AlternateName": "ISIS-1 Topside Sounder Ionogram CDFs at NASA's CDAWeb",
        "DOI": "https://doi.org/10.48322/7njf-d645",
        "ReleaseDate": "2025-12-04T13:29:41Z",
        "RevisionHistory": {
          "RevisionEvent": {
            "ReleaseDate": "2026-05-15T13:29:41Z",
            "Note": "ISIS 1 Collection metadata of ionograms created. JMW"
          }
        },
        "Description": "These ionograms were digitized from the original ISIS-1 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. Each ionogram consists of a fixed-frequency and and a swept-frequency portion. The time resolution between ionograms is typically 29 seconds.",
        "Acknowledgement": "Users please acknowledge the Coordinated Data Analysis Web (CDAWeb) at the NASA Goddard Space Flight Center, ISIS-1 SFS instrument Principal Investigator J. H. Whitteker and ISIS Data-Restoration project lead Robert F. Benson.",
        "PublicationInfo": {
          "Authors": "Whitteker, James H.",
          "PublicationDate": "2025-11-14T16:02:28Z",
          "PublishedBy": "Space Physics Data Facility"
        },
        "Contact": [
          {
            "PersonID": "spase://SMWG/Person/James.H.Whitteker",
            "Role": "PrincipalInvestigator"
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          {
            "PersonID": "spase://SMWG/Person/Robert.F.Benson",
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            "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=1969-009A-01",
            "Description": "Information about the Sweep Frequency Sounder experiment on ISIS-1."
          }
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      "AccessInformation": [
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          "RepositoryID": "spase://SMWG/Repository/NASA/GSFC/SPDF",
          "Availability": "Online",
          "AccessRights": "Open",
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              "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"
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          },
          "AccessURL": [
            {
              "Name": "HTTPS from SPDF",
              "URL": "https://spdf.gsfc.nasa.gov/pub/data/isis/topside_sounder/ionogram_cdf/isis1/",
              "Description": "HTTPS access to repository of ISIS-1 Ionograms in CDF format at NASA CDAWeb",
              "Language": "en"
            },
            {
              "Name": "CDAWeb",
              "URL": "https://cdaweb.gsfc.nasa.gov/cgi-bin/eval2.cgi?dataset=I1_AV_ALL&index=sp_phys",
              "ProductKey": "I1_AV_ALL",
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              "Language": "en"
            }
          ],
          "Format": "CDF",
          "Encoding": "None",
          "Acknowledgement": "Users please acknowledge the Coordinated Data Analysis Web (CDAWeb) at the NASA Goddard Space Flight Center, ISIS-1 SFS instrument Principal Investigator J. H. Whitteker and ISIS Data-Restoration project lead Robert F. Benson."
        },
        {
          "RepositoryID": "spase://SMWG/Repository/NASA/GSFC/SPDF",
          "Availability": "Online",
          "AccessRights": "Open",
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              "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"
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          },
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            "Name": "CDAWeb HAPI Server",
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          },
          "Format": "CSV",
          "Acknowledgement": "Users please acknowledge the Coordinated Data Analysis Web (CDAWeb) at the NASA Goddard Space Flight Center, ISIS-1 SFS instrument Principal Investigator J. H. Whitteker and ISIS Data-Restoration project lead Robert F. Benson."
        }
      ],
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          "ResourceName": "ISIS-1 Topside Sounder Average Ionogram over Fairbanks, AK: ULA, Latitude 65, Longitude 212",
          "Description": "This Ionogram was digitized from the original ISIS 1 Analog Telemetry Data on 7-Track Tape using the Facilities of the Data Evaluation Laboratory at NASA GSFC.",
          "MemberID": "spase://NASA/NumericalData/ISIS1/SFS/AverageIonogram/Fairbanks/PT29S",
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          }
        },
        {
          "ResourceName": "ISIS-1 Topside Sounder Average Ionogram over Kashima, Japan: KSH, Latitude 36, Longitude 141",
          "Description": "This Ionogram was digitized from the original ISIS 1 Analog Telemetry Data on 7-Track Tape using the Facilities of the Data Evaluation Laboratory at NASA GSFC.",
          "MemberID": "spase://NASA/NumericalData/ISIS1/SFS/AverageIonogram/Kashima/PT29S",
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        },
        {
          "ResourceName": "ISIS-1 Topside Sounder Average Ionogram over Kerguelen Island, France: KER, Latitude -49, Longitude 70 ",
          "Description": "This Ionogram was digitized from the original ISIS 1 Analog Telemetry Data on 7-Track Tape using the Facilities of the Data Evaluation Laboratory at NASA GSFC.",
          "MemberID": "spase://NASA/NumericalData/ISIS1/SFS/AverageIonogram/KerguelenIsland/PT29S",
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          "ResourceName": "ISIS-1 Topside Sounder Average Ionogram over Kwajalein, Marshall Islands: KWA, Latitude 9, Longitude 168 ",
          "Description": "This Ionogram was digitized from the original ISIS 1 Analog Telemetry Data on 7-Track Tape using the Facilities of the Data Evaluation Laboratory at NASA GSFC.",
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        },
        {
          "ResourceName": "ISIS-1 Topside Sounder Average Ionogram over Orroral, Australia: ORR, Latitude -36, Longitude 149",
          "Description": "This Ionogram was digitized from the original ISIS 1 Analog Telemetry Data on 7-Track Tape using the Facilities of the Data Evaluation Laboratory at NASA GSFC.",
          "MemberID": "spase://NASA/NumericalData/ISIS1/SFS/AverageIonogram/Orroral/PT29S",
          "StartDate": "1970-01-28T09:47:09Z",
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          }
        },
        {
          "ResourceName": "ISIS-1 Topside Sounder Average Ionogram over Ottawa, QC, Canada: OTT, Latitude 45, Longitude 284",
          "Description": "This Ionogram was digitized from the original ISIS 1 Analog Telemetry Data on 7-Track Tape using the Facilities of the Data Evaluation Laboratory at NASA GSFC.",
          "MemberID": "spase://NASA/NumericalData/ISIS1/SFS/AverageIonogram/Ottawa/PT29S",
          "StartDate": "1969-01-30T14:50:12Z",
          "StopDate": "1983-12-17T13:08:05Z",
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            "CenterLatitude": "45",
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          }
        },
        {
          "ResourceName": "ISIS-1 Topside Sounder Average Ionogram over Ottawa, QC, Canada, OTT, Version 2, Latitude 45, Longitude 284, 29 s Data ",
          "Description": "This Ionogram was digitized from the original ISIS 1 Analog Telemetry Data on 7-Track Tape using the Facilities of the Data Evaluation Laboratory at NASA GSFC.",
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            "CenterLatitude": "45",
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          }
        },
        {
          "ResourceName": "ISIS-1 Topside Sounder Average Ionogram over Ouagadougou, Burkina Faso: ODG, Latitude 14, Longitude 359 ",
          "Description": "This Ionogram was digitized from the original ISIS 1 Analog Telemetry Data on 7-Track Tape using the Facilities of the Data Evaluation Laboratory at NASA GSFC.",
          "MemberID": "spase://NASA/NumericalData/ISIS1/SFS/AverageIonogram/Ouagadougou/PT29S",
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            "CenterLatitude": "14",
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          }
        },
        {
          "ResourceName": "ISIS-1 Topside Sounder Average Ionogram over Quito, Equador: QUI, Latitude -1, Longitude 281",
          "Description": "This Ionogram was digitized from the original ISIS 1 Analog Telemetry Data on 7-Track Tape using the Facilities of the Data Evaluation Laboratory at NASA GSFC.",
          "MemberID": "spase://NASA/NumericalData/ISIS1/SFS/AverageIonogram/Quito/PT29S",
          "StartDate": "1969-01-31T04:20:04Z",
          "StopDate": "1978-06-22T04:44:35Z",
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            "CenterLongitude": "281"
          }
        },
        {
          "ResourceName": "ISIS-1 Topside Sounder Average Ionogram over Resolute Bay, NU, Canada: RES, Latitude 75, Longitude 265",
          "Description": "This Ionogram was digitized from the original ISIS 1 Analog Telemetry Data on 7-Track Tape using the Facilities of the Data Evaluation Laboratory at NASA GSFC.",
          "MemberID": "spase://NASA/NumericalData/ISIS1/SFS/AverageIonogram/ResoluteBay/PT29S",
          "StartDate": "1969-01-30T21:18:14Z",
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            "CenterLatitude": "75",
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          }
        },
        {
          "ResourceName": "ISIS-1 Topside Sounder Average Ionogram over Santiago, Chile: SNT, Latitude -33, Longitude 298",
          "Description": "This Ionogram was digitized from the original ISIS 1 Analog Telemetry Data on 7-Track Tape using the Facilities of the Data Evaluation Laboratory at NASA GSFC.",
          "MemberID": "spase://NASA/NumericalData/ISIS1/SFS/AverageIonogram/Santiago/PT29S ",
          "StartDate": "1969-01-31T01:29:39Z",
          "StopDate": "1972-12-25T07:01:13Z",
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          }
        },
        {
          "ResourceName": "ISIS-1 Topside Sounder Average Ionogram over Sodankyla, Finland: SOD, Latitude 67, Longitude 27",
          "Description": "This Ionogram was digitized from the original ISIS 1 Analog Telemetry Data on 7-Track Tape using the Facilities of the Data Evaluation Laboratory at NASA GSFC.",
          "MemberID": "spase://NASA/NumericalData/ISIS1/SFS/AverageIonogram/Sodankyla/PT29S",
          "StartDate": "1977-12-14T22:30:46Z",
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          }
        },
        {
          "ResourceName": "ISIS-1 Topside Sounder Average Ionogram over Tromso, Norway: TRO, Latitude 70, Longitude 19",
          "Description": "This Ionogram was digitized from the original ISIS 1 Analog Telemetry Data on 7-Track Tape using the Facilities of the Data Evaluation Laboratory at NASA GSFC.",
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            "CenterLatitude": "70",
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          }
        },
        {
          "ResourceName": "ISIS-1 Topside Sounder Average Ionogram over Winkfield, United Kingdom: WNK, Latitude 51, Longitude 359 ",
          "Description": "This Ionogram was digitized from the original ISIS 1 Analog Telemetry Data on 7-Track Tape using the Facilities of the Data Evaluation Laboratory at NASA GSFC.",
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          }
        },
        {
          "ResourceName": "ISIS-1 Topside Sounder Average Ionogram over Quito, Equador, Version 2: QUI, Latitude -1, Longitude 281",
          "Description": "This Ionogram was digitized from the original ISIS 1 Analog Telemetry Data on 7-Track Tape using the Facilities of the Data Evaluation Laboratory at NASA GSFC.",
          "MemberID": "spase://NASA/NumericalData/ISIS1/SFS/AverageIonogram/Quito/Corrected/PT29S",
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          }
        },
        {
          "ResourceName": "ISIS-1 Topside Sounder Average Ionogram over Fairbanks, AK, ULA, Version 2, Latitude 65, Longitude 212, 29 s Data",
          "Description": "This Ionogram was digitized from the original ISIS 1 Analog Telemetry Data on 7-Track Tape using the Facilities of the Data Evaluation Laboratory at NASA GSFC.",
          "MemberID": "spase://NASA/NumericalData/ISIS1/SFS/AverageIonogram/Version2/Fairbanks/PT29S",
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        },
        {
          "ResourceName": "ISIS-1 Topside Sounder Average Ionogram over Quito, Equador, QUI, Version 2, Latitude -1, Longitude 281, 29 s Data",
          "Description": "This Ionogram was digitized from the original ISIS 1 Analog Telemetry Data on 7-Track Tape using the Facilities of the Data Evaluation Laboratory at NASA GSFC.",
          "MemberID": "spase://NASA/NumericalData/ISIS1/SFS/AverageIonogram/Version2/Quito/PT29S",
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          }
        }
      ]
    }
  }
}