Radio spikes and the fragmentation of flare energy release

Details Radio spikes and the fragmentation of flare energy release Radio spikes and the fragmentation of flare energy release

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985soph...96..357b&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 96, April 1985, p. 357-370.

Physics

104

Energy Dissipation, Plasma Frequencies, Solar Flares, Solar Radio Emission, Spikes, Circular Polarization, Coronal Loops, Temporal Distribution

Scientific paper

Decimetric radio events with large numbers of spikes during the impulsive phase of flares have been selected. In the observing range of 100 to 1000 MHz some flares have of the order of 10000 spikes or more. The average half-power bandwidth of spikes has been measured to be only 1.5% of the spike frequency. Since the emission frequency is determined by some source parameter (such as plasma frequency or gyrofrequency) the source dimension must be a small fraction of the scale length. From the flare configuration a typical upper limit of the dimension of 200 km is found. Four events were analyzed in detail and compared to UV, SXR, and HXR data. The density of the loops where the SXR and HXR emission was observed has been measured before the flare. The plasma frequency well agrees with the observed frequency of spikes. The spikes thus originate close to or in the energy release region.

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