Gnevyshev gap effects in solar energetic particle activity

Details Gnevyshev gap effects in solar energetic particle activity Gnevyshev gap effects in solar energetic particle activity

Jan 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006adspr..38..484b&link_type=abstract

Advances in Space Research, Volume 38, Issue 3, p. 484-488.

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Scientific paper

Time dependence of many solar activity factors and related phenomena has a double-peak structure around the maximum phase of the 11-year cycle. A distinctive minimum between peaks was named the Gnevyshev gap. This paper deals with Gnevyshev gap effects in solar energetic particle activity during the last four solar cycles. A hypothesis that the Gnevyshev gap structure is a result of superposition of quasi-biennial and 11-year oscillation is examined. The occurrence rate of solar energetic particle events does not contradict the hypothesis given all the events with the peak proton intensity J(>10 MeV) > 1 cm-2 s-1 sr-1 are considered. However, the most powerful solar energetic particle events (ground level enhancements) demonstrate pronounced peak and valley structure which is sometimes not synchronous with quasi-biennial oscillations in other solar indices.

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