Distribution of solar energetic particle events over an 11-year solar cycle

Details Distribution of solar energetic particle events over an 11-year solar cycle Distribution of solar energetic particle events over an 11-year solar cycle

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....8.3413b&link_type=abstract

Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int

Physics

1

Scientific paper

Solar energetic particle (SEP) events are powerful signatures of solar activity. In general, the rate of SEP events changes in phase with the 11-year solar cycle, as it is seen, for instance, in the sunspot number. However, it is known that the rate of major SEP events suffers a reduction around solar activity maximum (Gnevyshev Gap). Other depressions in the SEP event rate also occur in the course of a solar activity cycle. Such a behaviour is a common feature of many solar activity parameters. A suggestion was put forward that these depressions are a consequence of the superposition of 11-year and quasibiennial oscillations of solar activity. Based on the different appearance of these phenomena on the Sun and in the interplanetary space, an attempt is undertaken to get some information on the SEP origin.

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