Unusual coronal activity between cycles 21 and 22

Details Unusual coronal activity between cycles 21 and 22 Unusual coronal activity between cycles 21 and 22

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990baicz..41..263r&link_type=abstract

Astronomical Institutes of Czechoslovakia, Bulletin (ISSN 0004-6248), vol. 41, no. 4, July 1990, p. 263-269.

Astronomy and Astrophysics

Astronomy

2

Magnetic Storms, Solar Activity, Solar Corona, Solar Cycles, Solar Terrestrial Interactions, Solar Radio Emission, Solar Wind

Scientific paper

An analysis of the solar activity indices (the Wolf number, the 2800 MHz radio flux, and the coronal index CI) during the minima of cycles 19-20, 20-21 and 21-22 has been carried out. It is evident that the variation pattern of these indices during the last minimum was different in comparison with the previous minima, mainly as far as CI is concerned. The mentioned changes include the magnitude of their values and the period from minimum to the systematic increase of their values: observed values increased and the period decreased from about 1.5 to 0.5 years. The possibility that the pattern of solar activity indices over the minimum might predict the subsequent cycle pattern has not been excluded. The high geomagnetic activity in February 1986 was the result of the flare activity and higher particle density in the corona above an active region, rather than a manifestation of the coronal holes themselves.

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