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... > Science Keywords > EARTH SCIENCE > SOLID EARTH > GEOMAGNETISM > GEOMAGNETIC INDICES > AA INDEX

Preferred term

AA INDEX  

Definition

  • A daily and half daily index of geomagnetic activity determined from the k indexes scaled at two nearly antipodal stations at invariant magnetic latitude 50 degrees (Hartland, England, and Canberra, Australia). The aa values are in units of 1 nT. The index is available back to 1868, and is provided by the Institut de Physique du Globe de Paris, France. (en)

Broader concept

Change note

  • 2013-02-18 09:52:55.0 [tbs1979] Insert Concept add broader relation (AA INDEX [5fd5ccc2-5edb-4823-940d-03a290a5c5fc,82403] - GEOMAGNETIC INDICES [ae35f430-6534-49de-8b4c-edfc1e98870a,62733]);
  • 2013-03-11 14:54:46.0 [tbs1979] insert Definition (id: null text: A daily and half daily index of geomagnetic activity determined from the k indexes scaled at two nearly antipodal stations at invariant magnetic latitude 50 degrees (Hartland, England, and Canberra, Australia). The aa values are in units of 1 nT. The index is available back to 1868, and is provided by the Institut de Physique du Globe de Paris, France. language code: en);

URI

https://gcmd.earthdata.nasa.gov/kms/concept/5fd5ccc2-5edb-4823-940d-03a290a5c5fc

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