Other
Scientific paper
Aug 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976azh....53..798c&link_type=abstract
Astronomicheskii Zhurnal, vol. 53, July-Aug. 1976, p. 798-811. In Russian.
Other
3
Astronomical Models, Continuous Radiation, Emission Spectra, Radio Spectra, Type 4 Bursts, Fine Structure, Plasma Turbulence, Solar Corona, Sunspots, Wave Packets, Whistlers
Scientific paper
Results are discussed for high-resolution spectrographic observations which detected a unique microstructure in the continuum of meter-wavelength type IV bursts. The continuous emission was found to be modulated by pulsations with a duration of seconds consisting of emission and absorption bands and dots which produced complex chaotic forms in the spectrum. A comparison is made with various emission microstructures observed in other phenomena, and the main requirements for a production mechanism are determined. A model of the emission source is proposed which consists of a magnetic force tube in which high-frequency radiation may be modulated by whistler wave packets. It is concluded that the presence of microstructure in the solar radio continuum may indicate a significant level of plasma turbulence in the source.
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