Millisecond radio spikes on long centimetre and short decimetre wavelengths and occurrence frequency

Details Millisecond radio spikes on long centimetre and short decimetre wavelengths and occurrence frequency Millisecond radio spikes on long centimetre and short decimetre wavelengths and occurrence frequency

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992ap%26ss.190...33j&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 190, no. 1, April 1992, p. 33-41.

Astronomy and Astrophysics

Astrophysics

2

Centimeter Waves, Decimeter Waves, Solar Radio Bursts, Radio Telescopes, Solar Atmosphere, Solar Corona, Solar Cycles, Solar Magnetic Field

Scientific paper

High time-resolution data observed in two periods, respectively, by three frequencies (1.42, 2.84, and 3.67 GHz) or four frequencies (1.42, 2.00, 2.84, and 4.00 GHz) of fast sampling radiotelescopes were processed. Obtained, were some significant results showing that during the obviously rising or maximum phases of solar cycle 22, the occurrence frequency of millisecond radio spikes at three or four frequencies decreased with the frequency increase and the highest occurrence frequency was at 1.42 GHz. Assuming the second x-mode is predominant in the growth rate of ECM instability, the magnetic intensity of source regions with spike bursts at the four frequencies is calculated and the occurrence frequency of millisecond radio spikes at long centimeter and short decimeter wavelengths interpreted. It is suggested that, owing to the Razing effect, when f is equal to or less than 126 MHz the occurrence frequency of millisecond radio spikes starts to decrease.

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