Physics
Scientific paper
Jan 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997ssrv...81..143k&link_type=abstract
Space Science Reviews, vol. 81, no, p. 143
Physics
10
Solar Atmosphere, Particle Beams, Solar Magnetic Field, Electron Beams, Magnetohydrodynamic Waves, Plasma Turbulence, Proton Beams, Neutral Beams, H Alpha Line, Whistlers
Scientific paper
This work addresses the observational and physical effects of particle beams in the solar atmosphere. Mainly electron beams are considered, but also some effects of proton and neutral beams are mentioned. Briefly describing acceleration mechanisms of superthermal particles, the main attention is devoted to effects influencing the particle beam propagation. The collisional energy losses and pitch-angle scattering, return current effects, mirroring in the converging magnetic field, and the scattering in the Alfven and whistler wave turbulence in specific situations are considered. The role of quasi-linear relaxation is discussed. Examples of observations showing effects of particle beams in the solar atmosphere are presented. Separate chapters are devoted to processes connected with particle beam bombardment of dense layers of the solar atmosphere: hard X-ray and gamma-ray flare emissions, evaporation process, asymmetry of optical chromospheric lines, and impact linear H-alpha line polarization. The beam induced energy release processes are also included. The presented effects of particle beams are summarized.
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