Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...333..366c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 333, Oct. 1, 1988, p. 366-385.
Astronomy and Astrophysics
Astrophysics
10
Magnetohydrodynamic Waves, Particle Acceleration, Shock Wave Propagation, Solar Flares, Ion Currents, Magnetohydrodynamic Turbulence, Shock Fronts, Turbulence Effects
Scientific paper
A scheme to accelerate low-energy (slightly greater than thermal energy) ions by a nearly perpendicular magnetohydrodynamic shock, lacking upstream turbulence, is proposed. The acceleration relies on the vigorous particle cross-field scattering by downstream turbulence, competing with the convection downstream, to send particles back to the shock front for acceleration. Some fraction of the low-energy ions can be accelerated up to a maximal energy, determined by the compression ratio and shock angle, before they escape upstream to, possibly, undergo the diffusion shock acceleration. This acceleration mechanism is a strong candidate for solving the particle-injection problem of the diffusive shock acceleration. An application of this acceleration scheme to the prompt ion acceleration during solar flares is discussed.
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