am index

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Term: am index

A mean, 3-hourly ”equivalent amplitude” of geomagnetic activity based on standardized K index data from a global network of 23 Northern and Southern Hemisphere stations by the lnstitut de Physique du Globe de Paris, France; am values are given in units of 1 nT.

Created 2023.04.16
Last Modified 2023.04.16
Contributed by Ryan McGranaghan