Band splitting in solar type II radio bursts

Details Band splitting in solar type II radio bursts Band splitting in solar type II radio bursts

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...399l.167t&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 399, no. 2, p. L167-L170.

Astronomy and Astrophysics

Astrophysics

5

Solar Spectra, Spectral Bands, Splitting, Type 2 Bursts, Cavitons, Electron Beams, Electrostatic Waves, Plasma Waves, Shock Fronts, Solar Corona

Scientific paper

In coronal shocks producing solar type II bursts, electron beams reflected from the shock front into the foreshock excite Langmuir waves which may develop into solitons and form density depletions (cavitons) on the background plasma distribution. Radiation emitted from these structures splits into two bands when the electron beam in addition to the original excites a second population of plasma waves at the local plasma frequency in the cavitons. The lower plasma density in the cavitons implies that these waves cannot escape. They interact to produce emission at the second harmonic as well as the fundamental of the caviton plasma frequency, lower than the original second harmonic and fundamental frequencies outside the caviton. Estimated density variations must be of the order of less than about 10 percent to account for the observed band splittings.

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