On the energy dependence of ionic charge states in solar energetic particle events

Details On the energy dependence of ionic charge states in solar energetic particle events On the energy dependence of ionic charge states in solar energetic particle events

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..598..317k&link_type=abstract

SOLAR AND GALACTIC COMPOSITION: A Joint SOHO/ACE Workshop. AIP Conference Proceedings, Volume 598, pp. 317-321 (2001).

Computer Science

5

Particle Emission, Solar Wind, Solar Wind Plasma, Sources Of Solar Wind, Planetary Bow Shocks, Interplanetary Shocks

Scientific paper

In large, gradual, interplanetary shock related solar energetic particle events an increase of the mean ionic charge of heavy ions with energy is often observed. There are large event to event variations. For Fe, for example, the observed variation in the energy range 0.1-1 Mev/nuc ranges from ~1-2 charge units to about 4 charge units. Large increases of the mean ionic charge with energy could be explained by acceleration at low coronal altitudes and charge stripping in this sufficiently dense environment. However, some of the events show evidence for local acceleration at interplanetary shocks. In this low-density environment the charge stripping mechanism would not work. We investigate rigidity dependent effects at quasi-parallel shocks, that could be due to mass per charge dependent effects of the acceleration, propagation, or loss processes, resulting in a mass per charge dependent exponential cutoff of the energy spectra. We show that a mass per charge dependent cutoff as observed recently in large, gradual solar energetic particle events will also result in an increase of the mean ionic charge with energy. .

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