The quasi-linear relaxation and bremsstrahlung of thick target electron beams in solar flares

Details The quasi-linear relaxation and bremsstrahlung of thick target electron beams in solar flares The quasi-linear relaxation and bremsstrahlung of thick target electron beams in solar flares

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...175..255m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 175, no. 1-2, March 1987, p. 255-262.

Astronomy and Astrophysics

Astrophysics

17

Bremsstrahlung, Electron Beams, Electrostatic Waves, Solar Corona, Solar Flares, Solar X-Rays, Coupled Modes, Electron Distribution, Microwaves, Momentum Transfer, Turbulent Flow

Scientific paper

The effects of quasi-linear interactions on the dynamics of thick-target electron beams in the solar corona are investigated. Coulomb collisions produce regions of positive gradient in electron distribution functions which are initially monotonic decreasing functions of velocity. In the resulting instability, energy and momentum are transferred from electrons to Langmuir waves and the asymptotic state is a plateau distribution. A one-dimensional model is presented in which quasi-linear and Coulomb interactions are taken into account: the coupled equations describing the evolution of electrons and Langmuir waves are solved numerically. The corresponding energy deposition rate and X-ray bremsstrahlung emission are evaluated, and shown to be insensitive to quasi-linear interactions. It is also shown that, for reasonable thick-target parameters, the weak turbulence theory is valid. The effects of relaxing the assumptions of the model are discussed. Emslie and Smith (1984) have claimed that an anomalous microwave flux is produced by a relaxed thick-target electron beam: it is pointed out that this claim is based on the unrealistic assumption that the primary spectrum of Langmuir waves is isotropic.

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