Alternate Definitions for sudden commencement

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Term: sudden commencement
Definition:

An abrupt increase or decrease in the northward component (see geomagnetic elements) of the geomagnetic field, which marks the beginning of a geomagnetic storm. SCs occur almost simultaneously worldwide but with locally varying magnitudes.

Created 2023.04.16
Last Modified 2023.04.16
Contributed by Ryan McGranaghan
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