Electron pitch angle scattering and the impulsive phase microwave and hard X-ray emission from solar flares

Details Electron pitch angle scattering and the impulsive phase microwave and hard X-ray emission from solar flares Electron pitch angle scattering and the impulsive phase microwave and hard X-ray emission from solar flares

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...257..354h&link_type=abstract

Astrophysical Journal, Part 1, vol. 257, June 1, 1982, p. 354-360.

Astronomy and Astrophysics

Astrophysics

44

Electron Acceleration, Electron Scattering, Electrostatic Waves, Microwaves, Solar Flares, Solar X-Rays, Coronal Loops, Landau Damping, Magnetohydrodynamics, Velocity Distribution

Scientific paper

Observations and theoretical considerations have led to a model for impulsive phase flare emission involving the heating and acceleration of thermal electrons in the coronal part of a magnetic loop. The bulk of the heated gas is confined between conduction fronts, but particles with velocities a few times greater than the thermal velocity can escape into the lower part of the loop. It is shown that, when the electron gyrofrequency exceeds the plasma frequency, the escaping electrons are unstable to the generation of electrostatic plasma waves which scatter the particles in pitch angle to a nearly isotropic distribution. It is also shown that this scattering can (1) enhance the microwave emission from the upper part of the loop, and (2) due to the Landau damping of both low and high phase velocity waves, can lead to one or two breaks in the impulsive-phase hard X-ray spectrum.

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