{
  "Spase": {
    "xmlns": "http://www.spase-group.org/data/schema",
    "xmlns:xsi": "http://www.w3.org/2001/XMLSchema-instance",
    "xsi:schemaLocation": "https://www.spase-group.org/data/schema https://www.spase-group.org/data/schema/spase-2.7.1.xsd",
    "Version": "2.7.1",
    "MetadataRightsList": {
      "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 SPASE metadata descriptions"
      }
    },
    "NumericalData": {
      "ResourceID": "spase://NASA/NumericalData/THEMIS/Ground/Athabasca/ASI/full_PT3S",
      "NamingAuthority": "NASA",
      "ResourceType": "NumericalData",
      "ResourceHeader": {
        "ResourceName": "Athabasca THEMIS Ground-based All Sky Imager; Full Resolution Images.",
        "AlternateName": "THEMIS-Ground ASF",
        "DOI": "https://doi.org/10.48322/8xek-2e75",
        "ReleaseDate": "2025-12-04T13:31:47Z",
        "RevisionHistory": {
          "RevisionEvent": [
            {
              "ReleaseDate": "2023-06-26T13:00:00Z",
              "Note": "Made changes requested by F. Frey, Updated version. Added contact and DOI info."
            },
            {
              "ReleaseDate": "2023-08-09T13:00:00Z",
              "Note": "Added Emma Spanswick to contacts."
            },
            {
              "ReleaseDate": "2025-08-05T13:12:36Z",
              "Note": "Added ObservedRegion(s). 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 value in Version tag. ZCB"
            },
            {
              "ReleaseDate": "2025-09-30T14:25:21Z",
              "Note": "Updated PublishedBy name to match ROR Registry. Added ResourceType and NamingAuthority. ZCB"
            },
            {
              "ReleaseDate": "2025-12-04T13:31:47Z",
              "Note": "Added MetadataRightsList. Updated to 2.7.1. ZCB"
            }
          ]
        },
        "Description": "THEMIS Ground All Sky Imager at Athabasca (54.71 deg GLat, 246.69 deg GLong): 256 x 256 pixel full resolution images of auroral oval.  The ASI stations monitor a 170 degree field of view imaging the auroral oval at kilometer resolution.  The ASI is comprised of a fisheye lens and CCD in a stainless steel enclosure topped with a transparent acrylic dome.  The CCD has a resolution of 256 x 256 pixels.  Exposure control ranges from 5 s to 1 ms although the typical data rate is one image every 3 seconds.  Silicone heaters keep the instrument within the nominal temperature range.  During daylight hours a sun shades deploy to protect the CCD.\n\t  ",
        "Acknowledgement": "We acknowledge NASA contract NAS5-02099 and V. Angelopoulos for use of data from the THEMIS Mission. Specifically:\nMartin Connors for building the Athabasca Station, S. Mende and E. Donovan for use of the ASI data, and the CSA for logistical support in fielding and data retrieval from the GBO stations.",
        "PublicationInfo": {
          "Authors": "Angelopoulos, V., Mende, S. B., Donovan, E., Frey, H. U., and Connor, M.",
          "PublicationDate": "2023-01-01T00:00:00",
          "PublishedBy": "Space Sciences Laboratory"
        },
        "Contact": [
          {
            "PersonID": "spase://SMWG/Person/Vassilis.Angelopoulos",
            "Role": "PrincipalInvestigator"
          },
          {
            "PersonID": "spase://SMWG/Person/Stephen.B.Mende",
            "Role": "CoInvestigator"
          },
          {
            "PersonID": "spase://SMWG/Person/Eric.Donovan",
            "Role": "CoInvestigator"
          },
          {
            "PersonID": "spase://SMWG/Person/Harald.U.Frey",
            "Role": "CoInvestigator"
          },
          {
            "PersonID": "spase://SMWG/Person/Emma.Louise.Spanswick",
            "Role": "CoInvestigator"
          }
        ],
        "InformationURL": {
          "Name": "THEMIS Summary Plots",
          "URL": "http://themis.ssl.berkeley.edu/gbo/display.py?view_type=summary",
          "Description": "Summary plots containing ASI thumbnail images; useful for determining when ASI data exists."
        },
        "PriorID": [
          "spase://VMO/NumericalData/THEMIS/Ground/CANMAG/ATHA/ASI/full_PT3S",
          "spase://VSPO/NumericalData/THEMIS/Ground/Athabasca/ASI/full_PT3S"
        ]
      },
      "AccessInformation": {
        "RepositoryID": "spase://SMWG/Repository/UCB/THEMIS",
        "Availability": "Online",
        "AccessRights": "Open",
        "AccessURL": {
          "Name": "THEMIS Web Data",
          "URL": "http://themis.ssl.berkeley.edu/data/themis/thg/l1/asi/atha/"
        },
        "Format": "CDF",
        "Encoding": "None"
      },
      "InstrumentID": "spase://SMWG/Instrument/THEMIS/Ground/CANMAG/ATHA/ASI",
      "MeasurementType": "ImageIntensity",
      "TemporalDescription": {
        "TimeSpan": {
          "StartDate": "2005-01-01T00:00:00",
          "RelativeStopDate": "-P1Y"
        },
        "Cadence": "PT3S"
      },
      "ObservedRegion": [
        "Earth.NearSurface.Ionosphere",
        "Earth.Surface"
      ],
      "Caveats": "ASF data is retrieved by physically swapping hard drives at GBO site, therefore the data is usually not available for at least 3-5 months.",
      "Parameter": [
        {
          "Name": "thg_asf_atha",
          "ParameterKey": "thg_asf_atha",
          "Description": "Full images of 256x256 pixels; saturation counts for each pixel.",
          "Units": "counts",
          "Structure": {
            "Size": "256 256"
          },
          "Wave": {
            "Qualifier": "Scalar",
            "WaveQuantity": "Intensity"
          }
        },
        {
          "Name": "thg_asf_atha_column",
          "ParameterKey": "thg_asf_atha_column",
          "Description": "Image column number; x-dimension, image width.",
          "Structure": {
            "Size": "256"
          },
          "Support": {
            "SupportQuantity": "Other"
          }
        },
        {
          "Name": "thg_asf_atha_row",
          "ParameterKey": "thg_asf_atha_row",
          "Description": "Image row number; y-dimension, image height.",
          "Structure": {
            "Size": "256"
          },
          "Support": {
            "SupportQuantity": "Other"
          }
        },
        {
          "Name": "thg_asf_atha_time",
          "ParameterKey": "thg_asf_atha_time",
          "Description": "Start of integration time, UTC, in seconds since 01-Jan-1970 00:00:00",
          "Caveats": "Not including leap seconds",
          "Units": "s",
          "ValidMin": "0.0",
          "ValidMax": "5.0E9",
          "FillValue": "NaN",
          "Support": {
            "SupportQuantity": "Temporal"
          }
        },
        {
          "Name": "thg_asf_atha_tend",
          "ParameterKey": "thg_asf_atha_tend",
          "Description": "Integration end time, UTC, in seconds since 01-Jan-1970 00:00:00",
          "Caveats": "Not including leap seconds",
          "Units": "s",
          "ValidMin": "0.0",
          "ValidMax": "5.0E9",
          "FillValue": "NaN",
          "Support": {
            "SupportQuantity": "Temporal"
          }
        }
      ]
    }
  }
}