Particle acceleration in impulsive solar flares. II - Nonrelativistic protons and ions

Details Particle acceleration in impulsive solar flares. II - Nonrelativistic protons and ions Particle acceleration in impulsive solar flares. II - Nonrelativistic protons and ions

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989soph..122...29s&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 122, no. 1, 1989, p. 29-52.

Physics

25

Particle Acceleration, Solar Flares, Solar Protons, Nonrelativistic Mechanics, Solar Corona

Scientific paper

Second-step acceleration of nonrelativistic protons and ions in impulsive solar flares is discussed, extending earlier calculations for relativistic electrons. The relevant particle transport equation is derived, discussing in detail the influence of the particle's effective charge and mass number on the various momentum gain (stochastic acceleration and diffusive shock wave acceleration) and loss (Coulomb interactions and particle escape) processes. Analytical solutions for the ion-momentum spectra in the hard-sphere approximation are given. The inclusion of Coulomb losses modifies the particle spectra significantly at kinetic energies smaller than E(B) = 0.64 x theta(e)/5.0 MeV/nucl. from the well-known Bessel function variation in long-duration flares.

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