Occurrence of solar decimetric spike bursts over a period of 4 years during the 21st cycle

Physics

Scientific paper

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Decimeter Waves, Solar Cycles, Solar Radio Bursts, Temporal Distribution, Histograms, Spectroheliographs, Spikes, Statistical Analysis, Type 3 Bursts

Scientific paper

Between October 1980 and December 1984, 460 DCIM events were observed with the Weissenau spectrograph. Parameters describing these events (ie., start and end frequencies, bandwidth, and DCIM burst duration) are evaluated statistically, and the main features are discussed in the context of associated burst types. Data indicate that the DCIM bursts are associated with type III bursts in 96 percent of the cases. Seventy-eight percent of the start frequencies are concentrated between 500 and 250 MHz while 69 percent of the bursts extended between 500 and 180 MHz. Since the duration distribution extended to much higher values than the corresponding distribution of type III burst groups, it is assumed that DCIM bursts are based on a different mechanisms which may be conditioned by steep density and temperature gradients.

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