{
  "Spase": {
    "xmlns": "http://www.spase-group.org/data/schema",
    "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/ASI/PT3S",
      "NamingAuthority": "NASA",
      "ResourceType": "NumericalData",
      "ResourceHeader": {
        "ResourceName": "THEMIS Ground-based All Sky Imager Level-0 Images",
        "AlternateName": "THEMIS-Ground ASI Images",
        "ReleaseDate": "2025-12-04T13:31:47Z",
        "RevisionHistory": {
          "RevisionEvent": [
            {
              "ReleaseDate": "2020-07-07T21:15:29Z",
              "Note": "Only known prior ReleaseDate of the metadata"
            },
            {
              "ReleaseDate": "2025-11-14T16:03:08Z",
              "Note": "Added PublicationInfo. Added ResourceType and NamingAuthority. ZCB"
            },
            {
              "ReleaseDate": "2025-12-04T13:31:47Z",
              "Note": "Added MetadataRightsList. Updated to 2.7.1. ZCB"
            }
          ]
        },
        "Description": "This data set at the THEMIS Mission Data website at University of California, Berkeley contains full resolution Level-0 Ground All Sky Images of the white light aurora for all observatories in North America.  The ASI stations each 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.  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.",
        "Acknowledgement": "We acknowledge NASA contract NAS5-02099 and V. Angelopoulos for use of data from the THEMIS Mission. Specifically S. Mende and E. Donovan for use of the ASI data, the CSA for logistical support in fielding and data retrieval from the GBO stations, and Canada Foundation for Innovation.",
        "PublicationInfo": {
          "Authors": "Angelopoulos, Vassilis; Mende, Stephen B.; Donovan, Eric",
          "PublicationDate": "2025-11-14T16:03:08Z",
          "PublishedBy": "University of California, Berkeley"
        },
        "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"
          }
        ],
        "PriorID": [
          "spase://VSPO/NumericalData/THEMIS/Ground/ASI/PT3S",
          "spase://VSPO/NumericalData/THEMIS/Ground/ASI/PT3S"
        ]
      },
      "AccessInformation": {
        "RepositoryID": "spase://SMWG/Repository/UCB/THEMIS",
        "Availability": "Online",
        "AccessRights": "Open",
        "AccessURL": {
          "Name": "Plots, CDF files, and listings from UCB",
          "URL": "http://themis.ssl.berkeley.edu/data/themis/thg/l0/asi/",
          "Description": "Web access to ASK data."
        },
        "Format": "CDF",
        "Encoding": "None"
      },
      "InstrumentID": [
        "spase://SMWG/Instrument/THEMIS/Ground/UCLA-GBO/CHBG/ASI",
        "spase://SMWG/Instrument/THEMIS/Ground/CANMAG/ATHA/ASI"
      ],
      "MeasurementType": "ImageIntensity",
      "TemporalDescription": {
        "TimeSpan": {
          "StartDate": "2005-01-01T01:00:00",
          "RelativeStopDate": "-P7D"
        },
        "Cadence": "PT3S"
      },
      "ObservedRegion": "Earth.Surface"
    }
  }
}