Physics – Plasma Physics
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jgr...10527315o&link_type=abstract
Journal of Geophysical Research, Volume 105, Issue A12, p. 27315-27322
Physics
Plasma Physics
23
Interplanetary Physics: Energetic Particles, Solar, Solar Physics, Astrophysics, And Astronomy: Flares, Space Plasma Physics: Ionization Processes
Scientific paper
A model of stochastic acceleration of heavy ions by Alfvén wave turbulence has been developed. It takes into account spatial diffusion, Coulomb losses, and the possibility of charge changes for ions during stochastic acceleration. The main processes influencing the ionic charge states are the stripping by thermal electrons and protons as constituents of a surrounding medium and dielectronic and radiative recombination. We have calculated energy spectra and charge distributions of nonthermal Fe ions as a sample species. The dependence of the charge distributions and energy spectra of iron on the parameters of the plasma (temperature and number density) is studied. We compare our results with measurements to date of the mean charge of iron in impulsive solar flare events and conclude that they indicate source plasma ionization temperatures between 6□×106 and 107K.
Kartavykh Yulia
Kocharov Leon
Kovaltsov Gennadi A.
Ostryakov Valery M.
Ruffolo David
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