Microbursts at meter-decameter wavelengths

Details Microbursts at meter-decameter wavelengths Microbursts at meter-decameter wavelengths

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990soph..127..165t&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 127, May 1990, p. 165-183. Research supported by the University of Maryland.

Physics

11

Brightness Temperature, Decametric Waves, Electron Beams, Solar Corona, Solar Radio Bursts, Frequency Shift, Plasma Waves, Spectroheliographs, Statistical Analysis, Type 3 Bursts

Scientific paper

The characteristics of microbursts are studied using a large data base obtained with the multifrequency radioheliograph of the Clark Lake Radio Observatory. Most of the new observations were made from July 29, 1985 to August 2, 1985. Characteristis such as frequency drift, source size, and brightness temperature are compared with the properties of normal type III bursts. It is found that (1) the brightness temperature is in the range 0.6-60 million K, and (2) the drift rate of the microbursts is slightly smaller than that of normal type III bursts, implying electron beams with speeds of about 0.2c. The microbursts can be explained as due to Langmuir waves spontaneous emitted by electron beams, whereas normal type III bursts are due to coherently emitted plasma waves in a two-stream instability.

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