The acceleration of back-scattered beam electrons in a return-current electric field

Details The acceleration of back-scattered beam electrons in a return-current electric field The acceleration of back-scattered beam electrons in a return-current electric field

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993soph..145..137k&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 145, no. 1, p. 137-150.

Physics

9

Backscattering, Electron Acceleration, Electron Beams, Electron Scattering, Solar Atmosphere, Electric Fields, Mathematical Models, Plasma Waves

Scientific paper

Using a 1-D hybrid model of the electron beam bombardment in a flare loop, it is demonstrated that beam electrons, back-scattered in dense layers of the solar atmosphere, are accelerated in the return-current electric field. This effect is shown in two regimes of the electron beam bombardment: (1) with a monoenergetic quasi-steady beam; and (2) with a sequence of 4 pulse beams. It is suggested that the mirroring of electrons at loop magnetic mirrors can amplify this process. The role of such acceleration for the formation of a collisionless return-current, and thus for a decrease of return-current losses, is discussed.

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