Generation of harmonic radiation in Solar Type III bursts-Contribution from STEREO-S/WAVES

Details Generation of harmonic radiation in Solar Type III bursts-Contribution from STEREO-S/WAVES Generation of harmonic radiation in Solar Type III bursts-Contribution from STEREO-S/WAVES

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh34b..07k&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SH34B-07

Astronomy and Astrophysics

Astronomy

[6954] Radio Science / Radio Astronomy

Scientific paper

It is generally believed that the harmonic radiation in solar Type III bursts is created by the coalescence of two oppositely directed Langmuir waves. The source of the Langmuir wave directed oppositely to the primary is less certain. The original suggestion of Ginzberg and Zheleznyakov (1958) has generally been abandoned. Two ideas remain, reflection of the primary wave at a density ramp (Melrose 1980), and three wave decay into a nearly opposite Langmuir wave and a wave of much lower frequency (Melrose et al 1986) . The daughter of a monochromatic three wave decay cannot be involved in electromagnetic radiation because the matching conditions are different. It is required that the primary and/or the daughter have sufficient bandwidth to satisfy both matching conditions. In earlier work, (e.g. Dulk et al 1998 ) the bandwidth was estimated from the estimated width of the plateau of the unstable electron distribution. STEREO-S/WAVES (Bougeret et al 2008) allows direct measurement of this bandwidth. Results of bandwidth measurements and their implications for three wave decay will be presented. Another source of bandwidth is possible, namely fluctuations in plasma density with corresponding fluctuations in primary and daughter frequency. Some discussion contrasting the two processes will be presented.

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