Solar proton events during solar cycles 19, 20, and 21

Details Solar proton events during solar cycles 19, 20, and 21 Solar proton events during solar cycles 19, 20, and 21

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990soph..126..385f&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 126, April 1990, p. 385-401.

Physics

33

Proton Flux Density, Solar Cycles, Solar Protons, Solar Flares, Sunspots

Scientific paper

Earlier studies based on a single solar cycle had resulted in a sharp division of events into 'ordinary' and 'anomalously large' events. Two such entirely separate distributions imply two entirely separate acceleration mechanisms, one common and the other very rare. The sharp division is neither required nor justified by this larger sample. Instead the event intensity forms a smooth distribution for intensities up to the largest observed implying that any second acceleration mechanism cannot be rare. Also, a clear bimodal variation of annual integrated flux with solar cycle phase but no statistically significant tendency for the large events to avoid sunspot maximum is found. There is almost no relation between the maximum sunspot number in a solar cycle and the solar cycle integrated flux. It is also found that for annual sunspot numbers greater than 35 there is no relation whatsoever between the annual sunspot numbers and annual integrated flux.

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