Physics
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991soph..131..351s&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 131, Feb. 1991, p. 351-361.
Physics
6
Coulomb Collisions, High Energy Interactions, Plasma Radiation, Proton Precipitation, Solar Atmosphere, Solar Protons, Photosphere, Plasma Frequencies, Plasma Waves, Proton Energy, Radio Emission
Scientific paper
Gamma-ray observations are discussed to determine the density of protons of about 1 MeV precipitating to the photosphere. It is shown that Coulomb collisions will produce a positive slope in the proton distribution for energies less than 0.1 MeV for traversed column depths greater than 10 to the 18th/sq cm. This could lead to plasma wave emission and radiation near the plasma frequency for densities about 3.1 x 10 to the 10th/cu cm and temperatures about 40,000 K where collisional and collisionless damping of the plasma waves is sufficiently weak. It is expected that these conditions will only be satisfied sporadically which leads to stationary radio emission limited in frequency and time. Recent radio observations of impulsive phase nondrifting patches in the 1-3 GHz range with duration 2-4 s are presented which could be produced by this mechanism.
Benz Arnold O.
Smith Donelson F.
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