Physics
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992soph..140..149k&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 140, no. 1, July 1992, p. 149-160. Research supported by Max-Planck-Institut für extraterre
Physics
11
Harmonic Radiation, Plasma Radiation, Solar Corona, Solar Radio Emission, Type 2 Bursts, Bow Waves, Electron Beams, Shock Waves, Solar Wind
Scientific paper
Observational evidence is presented for simultaneous fundamental, second, and third harmonic radio emission during an excessively strong type II burst on February 16, 1984. This burst was emitted from an active region behind the limb allowing for fair resolution of the wave bands. Interpreted as a triple harmonic system, three different mechanisms for higher harmonic emission are qualitatively discussed. These are a four-wave process which involves very strong Langmuir waves, a decay process first proposed by Cairns (1987) for higher harmonic emission near the earth's bow shock, and time evolution of the emitted frequency during Langmuir wave collapse. In sufficiently strong coronal shock waves, both of the former mechanisms may be more efficient than under solar wind conditions. In the third mechanism, Langmuir wave collapse may be driven by strong electron beams as are expected to exist in quasi-parallel shocks where electron reflection may be strongest.
Kliem Bernhard
Krueger Andre
Treumann Rudolf A.
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