{"HAPI":"3.3.1","status":{"code":1200,"message":"OK"},"startDate":"1981-01-01T00:00:00Z","stopDate":"2026-09-14T19:00:00Z","cadence":"PT1M","timeStampLocation":"center","modificationDate":"2026-09-02T20:45:04Z","maxRequestDuration":"P366D","title":"ASY/SYM Indices (Best Available, 1-minute)","description":"Mid-latitude geomagnetic disturbance indices ASY-D, ASY-H, SYM-D, SYM-H (1-minute): symmetric (SYM) and longitudinally asymmetric (ASY) disturbance fields in the H and D components; SYM-H is essentially equivalent to the hourly Dst index at 1-minute resolution. Provided by WDC for Geomagnetism, Kyoto. Best Available version: highest processing level per period (currently Provisional only). Timestamps are bin centers on the UT minute (timeStampLocation=center).","resourceID":"doi:10.14989/267216","datasetCitation":"World Data Center for Geomagnetism, Kyoto, S. Imajo, A. Matsuoka, H. Toh, and T. Iyemori (2022), Mid-latitude Geomagnetic Indices ASY and SYM (ASY/SYM Indices), doi:10.14989/267216","licenseURL":"https://wdc.kugi.kyoto-u.ac.jp/wdc/Sec3.html","parameters":[{"name":"Time","type":"isotime","units":"UTC","fill":null,"length":24,"label":"Time"},{"name":"asyDValue","type":"integer","units":"nT","fill":"99999","label":"ASY-D"},{"name":"asyHValue","type":"integer","units":"nT","fill":"99999","label":"ASY-H"},{"name":"symDValue","type":"integer","units":"nT","fill":"99999","label":"SYM-D"},{"name":"symHValue","type":"integer","units":"nT","fill":"99999","label":"SYM-H"},{"name":"versionCode","type":"integer","units":null,"fill":null,"label":"Version Code","description":"Processing status code Mm (M: 0=real-time,1=provisional,2=final; m=minor, the recalculation generation within the same major: 0=first conversion, 1 and above=reconverted after the source changed)."}]}