{
  "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/SOHO/CELIAS/PM/PT30S",
      "NamingAuthority": "NASA",
      "ResourceType": "NumericalData",
      "ResourceHeader": {
        "ResourceName": "SOHO Charge, Element, and Isotope Analysis System (CELIAS) Proton Monitor 30 Second Solar Wind data",
        "ReleaseDate": "2025-12-04T13:31:28Z",
        "RevisionHistory": {
          "RevisionEvent": [
            {
              "ReleaseDate": "2020-07-07T21:15:18Z",
              "Note": "Only known prior ReleaseDate of the metadata"
            },
            {
              "ReleaseDate": "2023-10-17T00:00:00Z",
              "Note": "Updated URLs, minor corrections, AK 20231017"
            },
            {
              "ReleaseDate": "2025-11-14T16:03:10Z",
              "Note": "Added PublicationInfo. 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": "2025-12-04T13:31:28Z",
              "Note": "Added MetadataRightsList. Updated to 2.7.1. ZCB"
            }
          ]
        },
        "Description": "The Proton Monitor is a solar wind Energy per Charge (E/Q) analyzer of a new design, consisting of a three-box deflection system followed by a wedge-shaped MicroChannel Plate (MCP) assembly. The data are derived from sets of 6 rates (one for each voltage step of the PM deflection system) obtained every 30 seconds. The voltage steps are spaced logarithmically (about 60% step size) from about 0.3 to 3 kV. At a given voltage step the energy per charge dynamic range is slightly more than a factor of 2. The overall geometry factor of the PM is about 1.0 x 10^-4 cm^2.",
        "Acknowledgement": "Please acknowledge the University of Maryland Space Physics Group",
        "PublicationInfo": {
          "Authors": "Ipavich, Fred M.",
          "PublicationDate": "2025-11-14T16:03:10Z",
          "PublishedBy": "University of Maryland, College Park; Space Physics Data Facility"
        },
        "Contact": {
          "PersonID": "spase://SMWG/Person/Fred.M.Ipavich",
          "Role": "PrincipalInvestigator"
        },
        "InformationURL": {
          "Name": "SOHO Celias Proton Monitor Home Page",
          "URL": "https://space.umd.edu/pm/",
          "Description": "Site hosting instrument information, some data and plots for SOHO Celias PM"
        },
        "PriorID": [
          "spase://VHO/NumericalData/SOHO/CELIAS/PT30S",
          "spase://VSPO/NumericalData/SOHO/CELIAS/PT30S",
          "spase://NASA/NumericalData/SOHO/CELIAS/PT30S"
        ]
      },
      "AccessInformation": {
        "RepositoryID": "spase://SMWG/Repository/UMD",
        "Availability": "Online",
        "AccessRights": "Open",
        "AccessURL": {
          "Name": "Proton Monitor Data at UMD",
          "URL": "https://l1.umd.edu/",
          "Description": "CELIAS Proton Monitor repository at UMD"
        },
        "Format": "Text",
        "Encoding": "ASCII"
      },
      "InstrumentID": [
        "spase://SMWG/Instrument/SOHO/CELIAS",
        "spase://SMWG/Instrument/SOHO/Ephemeris"
      ],
      "MeasurementType": [
        "ThermalPlasma",
        "Ephemeris"
      ],
      "TemporalDescription": {
        "TimeSpan": {
          "StartDate": "1996-01-20T20:17:30Z",
          "RelativeStopDate": "-P5M"
        },
        "Cadence": "PT30S"
      },
      "ObservedRegion": "Heliosphere.NearEarth",
      "Caveats": "On rare occassions the spacecraft's roll angle is changed for brief periods, during which the derived flow direction will refer to a different plane. A list of such times is available at http://umtof.umd.edu/pm/roll.html. In addition, since SOHO is not a spinning spacecraft, the deflection system was designed to have a wide angular acceptance (+- 15 deg). For technical reasons this leads to an ambiguity between incident angle and incident energy/charge; this ambiguity was designed into the PM to match as closely as possible the behavior of the deflection system for the main MTOF sensor. It is not the energy/charge but rather the mass/charge that is needed for interpretation of the MTOF mass data.",
      "Parameter": [
        {
          "Name": "Year",
          "ParameterKey": "Field 1",
          "Description": "Two digit year",
          "Support": {
            "SupportQuantity": "Temporal"
          }
        },
        {
          "Name": "Month",
          "ParameterKey": "Field 2",
          "Description": "String representation of month",
          "Support": {
            "SupportQuantity": "Temporal"
          }
        },
        {
          "Name": "Day",
          "ParameterKey": "Field 3",
          "Description": "Day of the Month",
          "Support": {
            "SupportQuantity": "Temporal"
          }
        },
        {
          "Name": "Time",
          "ParameterKey": "Field 4",
          "Description": "Colon seperated day of year, hour, minute and second (doy:HH:MM:SS)",
          "Support": {
            "SupportQuantity": "Temporal"
          }
        },
        {
          "Name": "Proton Speed",
          "ParameterKey": "Field 5",
          "Description": "Proton Speed",
          "Units": "km/s",
          "Particle": {
            "ParticleType": "Proton",
            "Qualifier": "Magnitude",
            "ParticleQuantity": "Velocity"
          }
        },
        {
          "Name": "Proton Density",
          "ParameterKey": "Field 6",
          "Description": "Proton number density",
          "Caveats": "Parameters are derived from a combination of fitting and moment techniques",
          "Units": "cm^-3",
          "Particle": {
            "ParticleType": "Proton",
            "Qualifier": [
              "Fit",
              "Moment"
            ],
            "ParticleQuantity": "NumberDensity"
          }
        },
        {
          "Name": "Proton Thermal Speed",
          "ParameterKey": "Field 7",
          "Description": "Most probable proton thermal speed",
          "Caveats": "Parameters are derived from a combination of fitting and moment techniques",
          "Units": "km/s",
          "Particle": {
            "ParticleType": "Proton",
            "Qualifier": [
              "Scalar",
              "Moment",
              "Fit"
            ],
            "ParticleQuantity": "ThermalSpeed"
          }
        },
        {
          "Name": "Proton arrival direction",
          "ParameterKey": "Field 8",
          "Description": "Proton arrival direction in degrees from north/south with positive meaning from the south",
          "Units": "degrees",
          "Particle": {
            "ParticleType": "Proton",
            "Qualifier": "DirectionAngle.ElevationAngle",
            "ParticleQuantity": "Velocity"
          }
        },
        {
          "Name": "Predicted Helium speed",
          "ParameterKey": "Field 9",
          "Description": "Predicted (not measured) Helium speed",
          "Particle": {
            "ParticleType": "Atom",
            "ParticleQuantity": "FlowSpeed",
            "AtomicNumber": "2"
          }
        },
        {
          "Name": "GSE X",
          "ParameterKey": "Field 10",
          "Description": "GSE X Component of SOHO position vector based on predicted orbit files ( 1 Re = 6378 km )",
          "Units": "Re",
          "UnitsConversion": "6.378e6>m",
          "CoordinateSystem": {
            "CoordinateRepresentation": "Cartesian",
            "CoordinateSystemName": "GSE"
          },
          "Support": {
            "SupportQuantity": "Positional"
          }
        },
        {
          "Name": "GSE Y",
          "ParameterKey": "Field 11",
          "Description": "GSE Y Component of SOHO position vector based on predicted orbit files ( 1 Re = 6378 km )",
          "Units": "Re",
          "UnitsConversion": "6.378e6>m",
          "CoordinateSystem": {
            "CoordinateRepresentation": "Cartesian",
            "CoordinateSystemName": "GSE"
          },
          "Support": {
            "SupportQuantity": "Positional"
          }
        },
        {
          "Name": "GSE Z",
          "ParameterKey": "Field 12",
          "Description": "GSE Z Component of SOHO position vector based on predicted orbit files ( 1 Re = 6378 km )",
          "Units": "Re",
          "UnitsConversion": "6.378e6>m",
          "CoordinateSystem": {
            "CoordinateRepresentation": "Cartesian",
            "CoordinateSystemName": "GSE"
          },
          "Support": {
            "SupportQuantity": "Positional"
          }
        },
        {
          "Name": "Heliocentric Range",
          "ParameterKey": "Field 13",
          "Description": "Heliocentric Range of SOHO in 10^6 km",
          "Units": "millions of km (10^6 km)",
          "UnitsConversion": "1e9>m",
          "Support": {
            "SupportQuantity": "Positional"
          }
        },
        {
          "Name": "Heliographic latitude",
          "ParameterKey": "Field 14",
          "Description": "Heliographic latitude of SOHO",
          "Units": "degrees",
          "Support": {
            "SupportQuantity": "Positional"
          }
        },
        {
          "Name": "Heliographic longitude",
          "ParameterKey": "Field 15",
          "Description": "Heliographic longitude of SOHO",
          "Units": "degrees",
          "Support": {
            "SupportQuantity": "Positional"
          }
        },
        {
          "Name": "Earth Carrington Rotation Number",
          "ParameterKey": "Field 16",
          "Description": "Earth Carrington Rotation Number",
          "Support": {
            "SupportQuantity": "Temporal"
          }
        }
      ]
    }
  }
}