Prompt acceleration of greater than 30 MeV per nucleon ions in solar flares

Details Prompt acceleration of greater than 30 MeV per nucleon ions in solar flares Prompt acceleration of greater than 30 MeV per nucleon ions in solar flares

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983soph...89..149m&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 89, Nov. 1983, p. 149-162.

Physics

21

Ion Accelerators, Particle Acceleration, Solar Corpuscular Radiation, Solar Flares, Electric Fields, Electron Acceleration, Energetic Particles, Gamma Ray Spectra, Magnetohydrodynamic Turbulence, Maxwell-Boltzmann Density Function, Plasma Heating, Plasma Jets, Solar Magnetic Field

Scientific paper

Energy release in the model proposed here is assumed to occur in a flaring loop, with the energy release region being less than or approximately equal to 10,000 km in dimensions and with an Alfven speed of approximately 3000 km/s. The acceleration is assumed to occur in two steps, with the second step attributed to stochastic acceleration by hydromagnetic turbulence, which is found to be fast enough under conditions that are not extreme. Emphasis is placed on the first step, referred to as preacceleration. It is noted that preacceleration mechanisms that involve accelerating a small fraction of ions from the tail of a Maxwellian distribution are unacceptable because they would lead to enormous abundance anomalies. Preacceleration is ascribed either to localized heating of ions to approximately 10 to the 9th K or to acceleration by potential electric fields. The latter mechanisms is favored, and some theoretical ideas based on observations of reconnection in the earth's magnetotail are discussed.

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