Physics
Scientific paper
Mar 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986soph..104..117s&link_type=abstract
(CNR, Workshop on Radio Continua during Solar Flares, Duino, Italy, May 27-31, 1985) Solar Physics (ISSN 0038-0938), vol. 104, M
Physics
71
Microwave Spectra, Solar Flares, Solar Radio Emission, Temporal Distribution, Circular Polarization, Electron Cyclotron Heating, Fine Structure, Interstellar Masers, Solar Magnetic Field, Spikes, Statistical Analysis, Stellar Spectrophotometry
Scientific paper
The microwave radiation from solar flares sometimes shows short and intensive spikes which are superimposed on the burst continuum. In order to determine the upper frequency limit of their occurrence and the circular polarization, a statistical analysis has been performed on digital microwave observations from 3.2 to 92.5 GHz. Additionally, fine structures have been investigated with a fast 32-channel spectrometer at 3.47 GHz. It was found that about 10 percent of the bursts show fine structures at 3.2 and 5.2 GHz, whereas none occurred above 8.4 Ghz. Most of the observed spikes were very short and their bandwidth varied from below 0.5 MHz to more than 200 MHz. Simultaneous observations at two further frequencies showed no coincident spikes at the second and third harmonic. The observations can be explained by the theory of electron cyclotron masering if the observed bandwidths are determined by magnetic field inhomogeneities or if the rise times are independent of the source diameters. The latter would imply source sizes between 50 and 100 km.
Magun Andreas
Staehli M.
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