Stochastic electron acceleration in stellar coronae

Details Stochastic electron acceleration in stellar coronae Stochastic electron acceleration in stellar coronae

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...143...23b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 143, no. 1, Feb. 1985, p. 23-28.

Astronomy and Astrophysics

Astrophysics

9

Electron Acceleration, Flare Stars, Stellar Coronas, Stochastic Processes, Electron Energy, Late Stars, Microwave Emission, Plasma Equilibrium, Plasma Turbulence, Stellar Flares, Synchrotron Radiation

Scientific paper

The acceleration of electrons by the second-order Fermi mechanism in a quasi-stationary turbulent plasma of dimension l, mean magnetic field strength B, and mean number density n is considered. The electrons suffer radiative losses and have a scattering means-free path that increases linearly with their momentum. This latter property results in an electron escape time that falls off inversely with the electron momentum, accounting for the inherent difficulties of energetic electron confinement and acceleration in compact regions. Criteria are determined for the existence of, and give exact analytic solutions for, the steady-state electron energy spectra. These spectra are characterized by an exponential cutoff above a given momentum determined by the synchrotron losses or the confinement time, depending on the physical characteristics (l,B,n) of the accelerating region. Implications of these solutions for electron acceleration associated with flare-like microwave emission in late-type stars are briefly discussed

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