Alternate Definitions for ap index

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Term: ap index

A mean, 3-hourly ”equivalent amplitude” of magnetic activity based on K index data from a planetary network of 11 Northern and 2 Southern Hemisphere magnetic observatories between the geomagnetic latitudes of 46° and 6° by the lnstitut fur Geophysik at Gottingen, Germany; ap values are given in units of 2 nT.

Created 2023.04.16
Last Modified 2023.04.16
Contributed by Ryan McGranaghan