The acceleration of heavy nuclei in solar flares

Details The acceleration of heavy nuclei in solar flares The acceleration of heavy nuclei in solar flares

Jun 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975p%26ss...23..955s&link_type=abstract

Planetary and Space Science, vol. 23, June 1975, p. 955-959.

Astronomy and Astrophysics

Astronomy

2

Heavy Nuclei, Particle Acceleration, Solar Cosmic Rays, Solar Flares, Abundance, Astronomical Models, High Energy Electrons, Ionization Cross Sections

Scientific paper

The overabundance of heavy nuclei in solar cosmic rays of energy below about 10 MeV/nucleon is explained by taking into account the pre-flare ionization states of these nuclei in the region where they are accelerated. A model is proposed which considers two-step accelerations associated with the initial development of solar flares. The first step is closely related to the triggering process of flares, while the second one starts with the development of the explosive phase. Further ionization of medium and heavy nuclei occurs through their interaction with keV electrons accelerated by the first-step acceleration. It is suggested that the role of these electrons is important in producing fully ionized atoms in the acceleration regions.

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