Physics
Scientific paper
Apr 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983soph...84..285d&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 84, April 1983, p. 285-288.
Physics
Continuous Spectra, Decametric Waves, Shock Fronts, Type 2 Bursts, Type 4 Bursts, Broadband, Emission Spectra, Frequency Response, Spectrographs
Scientific paper
Observations of a 1B gradual-rise solar flare, starting at 06:36 UT on April 27, 1979, made with the broad-band radiospectrograph at Weissenau, FRG (covering 1000 to 30 MHz), are reported. A type II/IV compound burst was observed, with a quasi-periodically varying low-frequency cutoff during the initial phase of the decametric continuum. The observations of Bhonsle anad Degaonkar (1980) are thus confirmed, with ionospheric interference effects ruled out. Their hypothesis, that the cutoff is due to the Razin effect in the coronal medium, and that its periodicity is due to the passage of an MHD shock wave through the trapped-electron-region type-IV-continuum source, is supported by the detection of a preceding type-II burst. The split-band fundamental centered at 66 MHz is used to determine 1.75 solar radii as the lower boundary of the continuum source.
Degaonkar S. S.
Urbarz H. W.
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