On the Microwave Spike Emission of the September 6, 1992 Flare |
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| Authors: | A T Altyntsev V V Grechnev Y Hanaoka |
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| Institution: | (1) Institute of Solar-Terrestrial Physics, Lermontov st. 126, Irkutsk, Russia, 664033;(2) Nobeyama Radio Observatory, NAOJ, Minamimaki, Minamisaku, Nagano, 384–13, Japan |
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| Abstract: | The main aim of this paper is to estimate, from multispectral observations, the plasma parameters in a microwave burst source which was also the site of spike emission. This information is essential for the determination of the spike emission process. By analyzing one-dimensional source distributions observed with the SSRT at 5.7 GHz and correlating them with Yohkoh X-ray and Nobeyama 17 GHz images, we have concluded that the microwave emitting region was larger than the soft X-ray loop-top source, and that the origin of the burst could be explained by gyrosynchrotron emission of non-thermal electrons in a magnetic field of approximately 100 G. It has been shown that the source of 5.7 GHz spikes observed during the burst was located close to an SXR-emitting loop with high density and temperature and a relatively low magnetic field. Thus, plasma emission is the most favourable radiation mechanism for the generation of the sub-arc-second microwave pulses. |
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