{
  "Spase": {
    "xmlns": "http://www.spase-group.org/data/schema",
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    "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": {
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        "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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    },
    "NumericalData": {
      "ResourceID": "spase://NASA/NumericalData/SDO/HMI/LOS_Dopplergram/PT720S",
      "NamingAuthority": "NASA",
      "ResourceType": "NumericalData",
      "ResourceHeader": {
        "ResourceName": "SDO/HMI line-of-sight Dopplergram, 720-Second Data",
        "DOI": "https://doi.org/10.48322/mn3e-wv09",
        "ReleaseDate": "2025-12-04T13:31:26Z",
        "RevisionHistory": {
          "RevisionEvent": [
            {
              "ReleaseDate": "2024-11-01T00:08:46",
              "Note": "Metadata created by SY"
            },
            {
              "ReleaseDate": "2024-11-18T00:08:46",
              "Note": "Added DOI by SY"
            },
            {
              "ReleaseDate": "2025-09-18T11:27:08Z",
              "Note": "Added ResourceType and NamingAuthority. 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 updated value in Version tag. ZCB"
            },
            {
              "ReleaseDate": "2025-09-30T14:25:18Z",
              "Note": "Updated PublishedBy name to match ROR Registry. ZCB"
            },
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              "ReleaseDate": "2025-12-04T13:31:26Z",
              "Note": "Added MetadataRightsList. Updated to 2.7.1. ZCB"
            }
          ]
        },
        "Description": "Dopplergrams are maps of solar surface velocity. The HMI (Camera 2) instrument takes 72 filtergrams to construct a single dopplergram. Six filtergrams are taken in six positions across the nominal 6173.3 Å spectral line; each filtergram is taken in two polarization states (right circularly polarized (RCP), or Stokes I-V, and left circularly polarized (LCP), or I+V). Assuming that the absorption line is a Gaussian and that the HMI filter transmission profiles are delta functions, the Fourier coefficients can be calculated and are then used to estimate the line-of-sight magnetic field strength B.",
        "PublicationInfo": {
          "Authors": "The HMI Consortium: Stanford University (USA); NASA Goddard Space Flight Center (USA); Lockheed Martin Solar and Astrophysics Laboratory (USA); National Center for Atmospheric Research (USA)",
          "PublicationDate": "2011-01-21T00:00:00",
          "PublishedBy": "Stanford University"
        },
        "Contact": [
          {
            "PersonID": "spase://SMWG/Person/Philip.H.Scherrer",
            "Role": "PrincipalInvestigator"
          },
          {
            "PersonID": "spase://SMWG/Person/Rick.Bogart",
            "Role": "GeneralContact"
          }
        ],
        "InformationURL": [
          {
            "Name": "The HMI website at Stanford",
            "URL": "http://hmi.stanford.edu/"
          },
          {
            "Name": "The SDO/HMI Instrument paper",
            "URL": "https://doi.org/10.1007/s11207-011-9834-2"
          }
        ]
      },
      "AccessInformation": {
        "RepositoryID": "spase://SMWG/Repository/Stanford/HMI-AIA.JSOC",
        "Availability": "Online",
        "AccessRights": "Open",
        "AccessURL": [
          {
            "Name": "JSOC Data Center",
            "URL": "http://jsoc.stanford.edu/ajax/lookdata.html?ds=hmi.V_720s[2020-01-01T00:00:00/60m]",
            "Style": "Search",
            "Description": "Change the date and the time to find the HMI data."
          },
          {
            "Name": "SDO/HMI Data Search via Virtual Solar Observatory",
            "URL": "https://sdac.virtualsolar.org/cgi/search?time=1&instrument=HMI&spectrum=1&version=current&build=1",
            "Description": "VSO path to JSOC-resident SDO HMI data files"
          }
        ],
        "Format": "FITS"
      },
      "InstrumentID": "spase://SMWG/Instrument/SDO/HMI",
      "MeasurementType": "Dopplergram",
      "TemporalDescription": {
        "TimeSpan": {
          "StartDate": "2010-04-24T19:11:26",
          "RelativeStopDate": "-P3D"
        },
        "Cadence": "PT720S"
      },
      "ObservedRegion": [
        "Sun",
        "Sun.Photosphere"
      ],
      "Parameter": {
        "Name": "FITS Data Array",
        "Description": "Line-of-sight velocity",
        "Cadence": "PT720S",
        "Units": "m/s",
        "Particle": {
          "ParticleType": "Ion",
          "Qualifier": "LineOfSight",
          "ParticleQuantity": "Velocity"
        },
        "SpatialCoverage": {
          "CoordinateSystem": {
            "CoordinateRepresentation": "Cartesian",
            "CoordinateSystemName": "HPC"
          },
          "Description": "Array size: 4096x4096\nPixel Resolution: 0.504 arcsec"
        }
      }
    }
  }
}