Direct determination of the ionic charge distribution of helium and iron in He-3-rich solar energetic particle events

Details Direct determination of the ionic charge distribution of helium and iron in He-3-rich solar energetic particle events Direct determination of the ionic charge distribution of helium and iron in He-3-rich solar energetic particle events

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...281..458k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 281, June 1, 1984, p. 458-462. Sponsorship: Bundesministerium für Forschung

Astronomy and Astrophysics

Astrophysics

52

Abundance, Charge Distribution, Energetic Particles, Helium Isotopes, Ion Charge, Iron, Solar Flares, Plasma Heating, Solar Corona, Solar Corpuscular Radiation

Scientific paper

The first direct measurement of the ionic charge distribution of the helium isotopes and of iron in (He-3)-Fe-rich solar energetic particle events is reported. No significant contribution of singly ionized helium to the events is found. The two-sigma upper limits for the He-3(+)/He-3(2+) and He-4(+)/He-4(2+) ratios are 0.02 and 0.03, respectively. The mean charge state of iron found by averaging five (He-3)-Fe-rich solar energetic particle events is 19 + or -2, significantly larger than the iron charge state for energetic solar particles in normal composition events. These results appear to favor the resonant heating model proposed by Fisk (1978). It is concluded that temperatures in the source region exceed 5 million K in the events under study.

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