{
  "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": "2.7.2",
    "MetadataRightsList": {
      "Rights": {
        "SchemeURI": "https://spdx.org/licenses/",
        "RightsIdentifierScheme": "SPDX",
        "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"
      }
    },
    "Catalog": {
      "ResourceID": "spase://NASA/Catalog/OMNI/Sector_Boundary_Crossing",
      "NamingAuthority": "NASA",
      "ResourceType": "Catalog",
      "ResourceHeader": {
        "ResourceName": "L. Svalgaard's Interplanetary Sector Boundary Crossing List",
        "DOI": "https://doi.org/10.48322/b9m5-f869",
        "ReleaseDate": "2026-02-02T13:10:26Z",
        "RevisionHistory": {
          "RevisionEvent": [
            {
              "ReleaseDate": "2023-05-11T12:34:56.789",
              "Note": "Updated to SPASE Version 2.5.0 if needed, Added DOI information, JMW"
            },
            {
              "ReleaseDate": "2026-02-02T13:10:26Z",
              "Note": "Added MetadataRightsList. Added ResourceType and NamingAuthority. Updated to 2.7.1. Changed http to https in top-level schemaLocation attribute. Fixed version number separator in top-level schemaLocation attribute. ZCB"
            },
            {
              "ReleaseDate": "2026-07-23T19:09:33",
              "Note": "The directory was changed. The broken links was replaced - access URL. Description updated. Time span changed. Contact end day added, parameters added, repository added, instrument added (OYU)"
            }
          ]
        },
        "Description": "This list of interplanetary sector boundary crossings has been compiled by Leif Svalgaard from ground magnetometer data and in situ interplanetary magnetic field observations Identification of the boundaries .  For each crossing, the day of crossing, the direction of \ncrossing (+to- or -to+) and the durations (in whole days) of single-polarity intervals on either side of the crossing are given.  ",
        "Acknowledgement": "Leif Svalgaard for creating and maintaining this \nevent list",
        "PublicationInfo": {
          "Authors": "Leif Svalgaard",
          "PublicationDate": "2022-01-01T00:00:00",
          "PublishedBy": "Leif Svalgaard, Stanford University"
        },
        "Contact": [
          {
            "PersonID": "spase://SMWG/Person/Leif.Svalgaard",
            "Role": "DataProducer",
            "StopDate": "2024-07-09T00:00:00",
            "Note": "Leif Svalgaard passed away on 10.11.2025"
          },
          {
            "PersonID": "spase://SMWG/Person/Olga.Y.Uritskaya",
            "Role": "MetadataContact"
          }
        ],
        "PriorID": [
          "spase://VSPO/Catalog/Svalgaard_SB_List",
          "spase://VSPO/Catalog/Svalgaard/Sector.Boundary.Crossing",
          "spase://NASA/Catalog/Svalgaard/Sector.Boundary.Crossing"
        ]
      },
      "AccessInformation": {
        "RepositoryID": "spase://SMWG/Repository/WSO",
        "AccessURL": {
          "Name": "Sector boundary crossing list",
          "URL": "http://wso.stanford.edu/SB/SB.html"
        },
        "Format": "Text"
      },
      "InstrumentID": "spase://SMWG/Instrument/OMNI",
      "PhenomenonType": "SectorBoundaryCrossing",
      "TimeSpan": {
        "StartDate": "1926-01-29T00:00:00",
        "StopDate": "2024-07-09T00:00:00"
      },
      "Parameter": [
        {
          "Name": "- , +",
          "Description": "Polarity indicators",
          "Support": {
            "SupportQuantity": "Other"
          }
        },
        {
          "Name": "Date",
          "Support": {
            "SupportQuantity": "Temporal"
          }
        },
        {
          "Name": "The quantity of days before boundary  crossing",
          "Support": {
            "SupportQuantity": "Other"
          }
        },
        {
          "Name": "The quantity of days after boundary  crossing",
          "Support": {
            "SupportQuantity": "Other"
          }
        }
      ]
    }
  }
}