Physics
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990soph..130....3m&link_type=abstract
(Committee of European Radio Astronomers, SNSF, URSI, et al., Workshop on Particle Beams in the Solar Atmosphere, Braunwald, Swi
Physics
35
Current Density, Particle Beams, Solar Atmosphere, Solar Corona, Solar Flares, Electron Beams, Gamma Rays, Ion Beams, Solar Magnetic Field, Solar X-Rays, Type 3 Bursts
Scientific paper
An overview of particle beams in the solar atmosphere is separated into discussions of (1) current-carrying beams, (2) current-neutralized electron beams, and (3) ion beams. The Alfven-Lawson limit on an electric current implies some severe limitations. Considerable progress has been made in understanding how electron beams in type III solar radio events propagate in a way that is consistent with the generation of Langmuir waves, but a completely consistent picture has not yet emerged. Such beams, and more importantly the electron beams that generate hard X-ray bursts require current neutralization; how the required return current is set up is still not entirely clear. There is direct evidence for ion beams with energies above about 10 MeV per nucleon from gamma-ray line emission; there is no unambiguous evidence for ion beams of lower energy. A mechanism is suggested for bulk energization of electrons due to dissipation of a parallel current in solar flares. Some outstanding problems concerning particle beams are identified.
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