{
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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/Alouette2/SFS/PT31S",
      "NamingAuthority": "NASA",
      "ResourceType": "Collection",
      "ResourceHeader": {
        "ResourceName": "Alouette-2 Topside Sounder Ionogram Data",
        "DOI": "https://doi.org/10.48322/sksz-8704",
        "ReleaseDate": "2026-05-13T13:28:27Z",
        "RevisionHistory": {
          "RevisionEvent": {
            "ReleaseDate": "2026-05-13T21:14:17Z",
            "Note": "First releaseDate of the metadata"
          }
        },
        "Description": "These ionograms were digitized from the original Alouette 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. The ionograms consist of swept-frequency operation (there is no fixed-frequency operation as in ISIS-1 and ISIS-2). The time resolution between ionograms is typically 31 seconds.",
        "Acknowledgement": "Users please acknowledge the Coordinated Data Analysis Web (CDAWeb) at the NASA Goddard Space Flight Center, Alouette-2 SFS instrument Principal Investigator J. H. Whitteker and Alouette/ISIS Data-Restoration project lead Robert F. Benson.",
        "PublicationInfo": {
          "Authors": "Whitteker, James H.",
          "PublicationDate": "2025-11-14T16:01:55Z",
          "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"
          },
          {
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            "Role": "MetadataContact"
          }
        ],
        "InformationURL": [
          {
            "Name": "ISIS/Alouette Topside Sounder Data Restoration Project",
            "URL": "https://spdf.gsfc.nasa.gov/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=1965-098A-01",
            "Description": "Information about the Sweep Frequency Sounder experiment on Alouette-2."
          }
        ],
        "PriorID": [
          "spase://VWO/NumericalData/Alouette2/SFS/PT31S",
          "spase://VSPO/NumericalData/Alouette2/SFS/PT31S"
        ]
      },
      "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": "HTTP access to files at SPDF",
            "URL": "https://spdf.gsfc.nasa.gov/pub/data/alouette/topside_sounder/ionogram_cdaweb/alouette2/",
            "Description": "FTP access to repository of Alouette-2 Ionograms in CDF format at NASA CDAWeb. The CDF files are organized by ground station, where each ground station is represented by a three letter ID and a two-digit code. The full names for each station are provided at https://spdf.gsfc.nasa.gov/isis/isis-table1-new.html",
            "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": "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."
      },
      "Member": [
        {
          "ResourceName": "Alouette-2 Topside Sounder Average Ionogram over Fairbanks, AK",
          "Description": "This Ionogram was digitized from the original Alouette 2 Analog Telemetry Data on 7-Track Tape using the Facilities of the Data Evaluation Laboratory at NASA GSFC",
          "MemberID": "spase://NASA/NumericalData/Alouette2/SFS/AverageIonogram/Fairbanks/PT31S",
          "StartDate": "1965-11-29T06:20:12Z",
          "StopDate": "1965-11-29T06:32:42Z",
          "SpatialCoverage": {
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              "CoordinateSystemName": "GEO"
            },
            "CenterLatitude": "65",
            "CenterLongitude": "212"
          }
        },
        {
          "ResourceName": "Alouette-2 Topside Sounder Average Ionogram over Falkland Is., United Kingdom",
          "Description": "This Ionogram was digitized from the original Alouette 2 Analog Telemetry Data on 7-Track Tape using the Facilities of the Data Evaluation Laboratory at NASA GSFC",
          "MemberID": "spase://NASA/NumericalData/Alouette2/SFS/AverageIonogram/FalklandIslands/PT31S",
          "StartDate": "1965-12-01T01:31:39Z",
          "StopDate": "1966-12-28T03:00:28Z",
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          }
        },
        {
          "ResourceName": "Alouette-2 Topside Sounder Average Ionogram over Lima, Peru",
          "Description": "This Ionogram was digitized from the original Alouette 2 Analog Telemetry Data on 7-Track Tape using the Facilities of the Data Evaluation Laboratory at NASA GSFC",
          "MemberID": "spase://NASA/NumericalData/Alouette2/SFS/AverageIonogram/Lima/PT31S",
          "StartDate": "1966-11-11T20:34:08Z",
          "StopDate": "1967-01-15T12:59:00Z",
          "SpatialCoverage": {
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              "CoordinateSystemName": "GEO"
            },
            "CenterLatitude": "-12",
            "CenterLongitude": "283"
          }
        },
        {
          "ResourceName": "Alouette-2 Topside Sounder Average Ionogram over Quito, Equador",
          "Description": "This Ionogram was digitized from the original Alouette 2 Analog Telemetry Data on 7-Track Tape using the Facilities of the Data Evaluation Laboratory at NASA GSFC",
          "MemberID": "spase://NASA/NumericalData/Alouette2/SFS/AverageIonogram/Quito/PT31S",
          "StartDate": "1965-11-29T13:47:39Z",
          "StopDate": "1968-01-01T04:12:17Z",
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            },
            "CenterLatitude": "-1",
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          }
        },
        {
          "ResourceName": "Alouette-2 Topside Sounder Average Ionogram over Santiago, Chile",
          "Description": "This Ionogram was digitized from the original Alouette 2 Analog Telemetry Data on 7-Track Tape using the Facilities of the Data Evaluation Laboratory at NASA GSFC",
          "MemberID": "spase://NASA/NumericalData/Alouette2/SFS/AverageIonogram/Santiago/PT31S",
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          }
        },
        {
          "ResourceName": "Alouette-2 Topside Sounder Average Ionogram over Winkfield, United Kingdom",
          "Description": "This Ionogram was digitized from the original Alouette 2 Analog Telemetry Data on 7-Track Tape using the Facilities of the Data Evaluation Laboratory at NASA GSFC",
          "MemberID": "spase://NASA/NumericalData/Alouette2/SFS/AverageIonogram/Winkfield/PT31S",
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          }
        }
      ]
    }
  }
}