Low level decimetric (1.6 GHz) solar burst activity

Details Low level decimetric (1.6 GHz) solar burst activity Low level decimetric (1.6 GHz) solar burst activity

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986stin...8712524s&link_type=abstract

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Physics

Decimeter Waves, Solar Radio Bursts, Solar Radio Emission, Time Dependence, Beam Interactions, Circular Polarization, Electron Cyclotron Heating, High Resolution, Plasma Interactions

Scientific paper

Observations of solar bursts were carried out in the month of July 1985 for about two weeks in R and L circular polarization with high sensitivity (0.01 s.f.u.) and high time resolution (3 msec) at 1.6 GHz, by using the 13.7 m Itapetinga antenna. Five intervals of solar burst activity, each one lasting for a couple of minutes, were observed and indicated a variety of decimetric bursts. Predominantly two classes of fast burst were observed: i.e., spike and blip. However, some of those bursts were two orders of magnitude less intense than those reported earlier. Detailed properties of all these bursts are presented. Low level blips have typical duration approx. 350 msec, excitation time approx. 130 + or - 25 msec, decay time approx. 200 + or - 25 msec and a low degree of circular polarization of about 15%. Investigation of these properties suggests that blips probably originate at second harmonic by beam plasma interaction. Also, low level ms-spikes with the half power duration in the range of 5 to 20 msec suggest that source sizes should be smaller than 50 Km and/or the bandwidth of emission should be 0.001%, if the process of emission is electron cyclotron maser.

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