Abundances, charge states, and energy spectra of helium and heavy ions during solar particle events

Details Abundances, charge states, and energy spectra of helium and heavy ions during solar particle events Abundances, charge states, and energy spectra of helium and heavy ions during solar particle events

Aug 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975icrc....5.1576g&link_type=abstract

In: International Cosmic Ray Conference, 14th, Munich, West Germany, August 15-29, 1975, Conference Papers. Volume 5. (A76-26851

Physics

4

Abundance, Alpha Particles, Energy Spectra, Heavy Ions, Particle Energy, Solar Flares, Carbon, Helium, Kinetic Energy, Particle Flux Density, Solar Cosmic Rays, Solar Protons

Scientific paper

Carbon and oxygen energy spectra observed during several solar events indicate a systematic deviation of these spectra from a simple power law: the spectra bend down below about 100 keV/nuc and the amount of this bending is highly correlated with the size of the flare, as measured by the 'event averaged' flux of 130-220 keV protons. The energy spectra of helium computed for the same time periods do not show a similar feature. A large variability of the alpha/CNO ratio is found from event to event (from 2 to about 20 at 40 keV/nuc), and in all cases examined the carbon and oxygen nuclei are nearly fully stripped. These results are interpreted as evidence for storage of energetic ions in hot coronal regions, followed by strong adiabatic deceleration.

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