Physics
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990soph..130..253s&link_type=abstract
(Committee of European Radio Astronomers, SNSF, URSI, et al., Workshop on Particle Beams in the Solar Atmosphere, Braunwald, Swi
Physics
29
Solar Atmosphere, Solar Flares, Solar X-Rays, X Ray Spectra, Bremsstrahlung, Electron Acceleration, Electron Energy, Particle Acceleration
Scientific paper
The problem of producing the hard X-ray burst at the onset of solar flares may be thought of in terms of the problem of producing the nonthermal electrons which emit the X-rays via bremsstrahlung. It is not feasible to accelerate the electrons as a minor constituent of the total energetic particle population. Therefore, it is necessary to invoke a more sophisticated process for the electron acceleration. This paper describes a mechanism for achieving this via an initial acceleration of a neutralized ion beam. When such a beam impacts the chromosphere, the electrons start to scatter while the ions continue downwards, rapidly setting up an electric field which is either cancelled by the inflow of background chromospheric electrons or results in the runway acceleration of beam electrons. In the former case the result is simply heating, whereas in the latter case much of the ion kinetic energy is transferred into electron kinetic energy.
Haines M. G.
Simnett George M.
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