Heavy Ions From Impulsive SEP Events and Constraints on the Plasma Temperature in the Acceleration Site

Details Heavy Ions From Impulsive SEP Events and Constraints on the Plasma Temperature in the Acceleration Site Heavy Ions From Impulsive SEP Events and Constraints on the Plasma Temperature in the Acceleration Site

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh62b07k&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SH62B-07

Physics

2118 Energetic Particles, Solar, 7519 Flares, 7807 Charged Particle Motion And Acceleration, 7823 Ionization Processes, 7843 Numerical Simulation Studies

Scientific paper

We compare the mean charge states of heavy ions (O, Ne, Mg, Si and Fe) as observed with ACE/SEPICA during several solar energetic particle events in 1998 with model calculations. A model of stochastic acceleration that includes a self-consistent treatment of the charge states of the affected ions is applied to estimate the plasma temperature in the acceleration site for 8 impulsive events. This model takes into account ionization due to collisions with electrons and heavy particles (protons and He) as well as recombination due to collisions with electrons. In general the temperatures obtained for Ne, Mg and Fe ions appear higher than those for O and Si. We compare our results with the corresponding ionization temperatures for gradual events observed in previous solar cycles and in 1997-1998. Partially supported by the Russian Foundation of Basic Research (grant 00-02-17031), a Basic Research Grant from the Thailand Research Fund, and NASA grants NAG 5-8134 and NAG 5-6912.

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