Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...216l..53s&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 216, Aug. 15, 1977, p. L53-L57.
Astronomy and Astrophysics
Astrophysics
20
Harmonic Radiation, Plasma Waves, Solar Wind, Type 3 Bursts, Electric Fields, Isotropic Media, Plasma Turbulence, Plasma-Particle Interactions
Scientific paper
Observations of type III radio bursts and their accompanying plasma waves in the solar wind are analyzed and shown to provide no definitive support for coherent parametric processes in these bursts. It is shown that the incoherent weak turbulent process of induced scattering on the polarization clouds of ions is sufficient to produce a quasi-isotropic spectrum of plasma waves. This in turn leads to emission near the second harmonic of the plasma frequency which is almost three orders of magnitude larger than observed for the burst that occurred at 18:10 UT on March 31, 1976. The modification of this result due to coherent parametric processes is considered. It is found that there is nothing in presently available results to indicate that coherent parametric processes would definitely increase this efficiency.
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