Physics
Scientific paper
Oct 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998kosis..36..465k&link_type=abstract
Kosmicheskie Issledovaniia, Tom 36, No. 5, p. 465 - 474
Physics
3
Solar Flares: Helium, Solar Flares: Plasma Diagnostics, Solar Flares: Ions
Scientific paper
In order to explain the energy spectra and abundances of the He+ and He++ solar flare ions measured in some works, the authors calculated the behavior of these ions in solar plasma, taking into account both their stochastic acceleration by Alfvén waves and the possibility of charge exchange with the surrounding plasma. The results agree with the experiments if the plasma in the regions where acceleration takes place has a concentration and temperature on the order of N = 2×107 cm-3 and T = 6.31×104K, respectively. Recent observations of solar flares onboard the Yohkoh satellite have demonstrated that it is apparently impractical to expect the existence of such rarefied and low-temperature plasma in the flare loops. The calculations indicate that the high abundance of He+ is most likely due to its nonsolar origin. Some possibilities of enrichment of energetic particle fluxes by He+ ions are briefly discussed.
Kartavykh Yu. Yu.
Ostryakov Valery M.
Stepanov Yu. I.
Yoshimori Masato
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