Physics
Scientific paper
Jun 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993soph..145..347c&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 145, no. 2, p. 347-357.
Physics
20
Magnetic Storms, Periodic Variations, Solar Activity, Solar Terrestrial Interactions, Geomagnetism, Solar Cycles, Solar Prominences
Scientific paper
Evidence for a seasonal dependence of the geoeffectiveness of solar events is presented. It is assumed that the energy content of coronal mass ejections linked to great storms is related to the size of the electromagnetic and particle signatures of the associated solar events. Solar sources of the largest magnetic storms for the period 1957-1990 were examined. Observations indicate that the great storms of the last four solar cycles occurred near the equinox, and that storms occurring near the solstice were preceded by large solar flares. Central meridian proton flares were followed by significantly larger geomagnetic storms than similar storms near the solstices. It is concluded that the strong-semiannual variation of great storms is due to the absence, near the solstices, of great storms associated with disappearing solar filaments and with moderately sized solar flares.
Cliver Edward W.
Crooker Nancy U.
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