Particle acceleration during the explosive phase of a solar flare

Details Particle acceleration during the explosive phase of a solar flare Particle acceleration during the explosive phase of a solar flare

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982acasn..23..317z&link_type=abstract

(Acta Astronomica Sinica, vol. 23, no. 4, 1982, p. 317-326) Chinese Astronomy and Astrophysics (ISSN 0275-1062), vol. 7, June 19

Astronomy and Astrophysics

Astrophysics

2

Electric Fields, Energetic Particles, Particle Acceleration, Plasma Turbulence, Solar Flares, Solar Protons, Energy Spectra, Neutral Sheets, Plasma Oscillations, Solar Electrons

Scientific paper

Starting with the quasi-linear equation of the distribution function of particles in a regular electric field, a combined diffusion coefficient in the momentum space combining the effects of the regular field and a turbulent field is obtained, and a combined mechanism of acceleration by the regular and turbulent fields in the neutral sheet of solar proton flares is proposed. It is shown by calculation that conditions in solar proton flares are such that the charged particles can be effectively accelerated to tens of MeV, even to about 1 GeV. It is shown that the combined acceleration by a regular electric field and ion-acoustic turbulence pumps the protons and other heavy ions into ranges of energy where they can be accelerated by Langmuir turbulence. By considering the combined acceleration by Langmuir turbulence and the regular electric field, the observed spectrum of energetic protons and the power-law spectrum of energetic electrons can be reproduced.

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