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GEOMAGNETIC SUDDEN COMMENCEMENTS (from SGD Explanation of Data Reports)

Sudden Commencements and Solar Flare Effects - These reports are provided by
Observatorio del Ebro, Roquetes, Spain, on behalf of the IAGA Service on
Rapid Magnetic Variations. The Sudden Commencements (ssc) and Solar Flare
effects (sfe) are from magnetograms of the worldwide network of magnetic
observatories. The stations, together with their abbreviations, are given in
the series IAGA Bulletin No. 32 which contains the yearly compilation of these
data. Before January 1966 these reports were published periodically in
Journal of Geophysical Research. From then until 1970 they were published
quarterly in Solar-Geophysical Data (SGD).

Beginning with December 1970 these data are published monthly and, thus, are
based on fewer reports and differ slightly from similar data published
previously. The decision to publish this less complete report was made in
order to make the data available more rapidly. The table for ssc's gives
date and UT time of event with stations by three-letter abbreviations grouped
by quality A, B, C, or -, where A means very remarkable; B means fair, but
unmistakable; and C means very poor, doubtful, and - means no quality figure
given. The * means that the ssc, at least in one component, was preceded by
a small reversed impulse. For ssc's, only events reported by at least five
observatories are reported. The list of sfe's gives the beginning and ending
of the event in UT and all reported cases are reported. If an sfe is
confirmed by solar or ionospheric events, the name of the reporting
observatory is underlined or a + sign appears in the digital file.