On the origin of subsecond pulses at 17 GHz |
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| Authors: | Altyntsev AT Nakajima H Takano T Rudenko GV |
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| Institution: | (1) Institute of Solar-Terrestrial Physics, 126, Lermontov St., Irkutsk, Russia, 664033;(2) Nobeyama Radio Observatory, NAOJ, Minamimaki, Minamisaku, Nagano, 384-13, Japan;(3) Department of Natural Science, Chiba University, Chiba, Japan |
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| Abstract: | We have analyzed three flare events with subsecond structures in hard X-rays (CGRO/ BATSE) and 17 GHz data (Nobeyama radioheliograph). It was shown that microwave subsecond brightenings (SSB) were generated by directly precipitating electrons with energy of 100–200 keV from tiny regions close to footpoints. In two events, when high correlation between microwaves and X-rays was observed, the SSB can be interpreted in terms of gyrosynchrotron emission. Plasma emission seems to be a more credible explanation of the spontaneous pulses in the event when poor correlation with X-rays was observed. |
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