Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...229..413e&link_type=abstract
Astrophysical Journal, Part 1, vol. 229, Apr. 1, 1979, p. 413-418.
Astronomy and Astrophysics
Astrophysics
15
Cascade Flow, Cyclotron Resonance, Mathematical Models, Particle Acceleration, Solar Flares, Turbulent Flow, Abundance, Damping, Energy Transfer, Enrichment, Heavy Elements, Magnetohydrodynamic Waves, Particle Size Distribution
Scientific paper
It is pointed out that cyclotron damping of cascading turbulence can be a very efficient acceleration process because the turbulence is generally damped by the suprathermal tail of the particle distribution. Using a simplified approach to the transfer of wave energy down the spectrum, analytic time-dependent solutions are derived which describe the growth of the tail and its effect back on the turbulence. They suggest that with this mechanism, a sizable fraction of all the available energy ends up in a very small minority of the particles at the flare site, in accord with observations. Preferential acceleration of heavy elements is generally expected. The enhancement mechanism is very sensitive; and if He-3 is preaccelerated by even a modest amount, it could be enhanced by many orders of magnitude, as observed in some flares.
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