The influence of the ionic charge composition on heavy ion abundance variations during solar energetic particle events

Details The influence of the ionic charge composition on heavy ion abundance variations during solar energetic particle events The influence of the ionic charge composition on heavy ion abundance variations during solar energetic particle events

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983icrc....4..123k&link_type=abstract

IN: International Cosmic Ray Conference, 18th, Bangalore, India, August 22-September 3, 1983, Conference Papers. Volume 4 (A85-2

Computer Science

Abundance, Heavy Ions, Solar Activity Effects, Solar Corpuscular Radiation, Carbon, Helium, Interplanetary Space, Ion Charge, Magnetic Rigidity, Mass Ratios, Oxygen

Scientific paper

In recent years, heavy-ion compositional variations (He/p, Fe/O, O/He, O/C) in the MeV/nucleon energy range during individual solar energetic particle events have been repeatedly reported. Whereas the Fe/O and He/p ratio changes could be consistently explained, at least for most of the events, by rigidity-dependent interplanetary propagation, the observed variations of the O/He and O/C ratios appeared to be rather puzzling. Presented is an investigation of the influence of the actual ionic charge distribution of He, C, and O on compositional variations during the onset phase of solar energetic particle events; a numerical model of the interplanetary propagation is used. It is found that the rigidity-dependent interplanetary propagation with lambda (11) = 0.1 AU at 1 MeV/nucleon and lambda (11) varying as R Exp n (n = 0.5-1.) results in a variation of the O/He-ratio at less than 1 MeV/nucleon by a factor of 2-5 during the onset phase of the solar energetic particle event if ionic charge distributions consistent with recently experimentally determined distributions are used.

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