A Type IV Radio Burst Associated with Type III Burst,Pulsation and Spike Emissions |
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Authors: | Wang M Xie RX Duan CC Yan YH Sych RA Altyntsev AT |
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Institution: | (1) Yunnan Observatory, National Astronomical Observatories, Chinese Academy of Sciences, Kunming, 650011, China;(2) National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100012, China;(3) Institute of Solar-Terrestrial Physics, 126, Lermontov St., Irkutsk, 664033, Russia |
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Abstract: | A type IV radio burst accompanied by several normal- and reverse-drifting type III bursts, multiple long-term quasi-periodic pulsations and spikes was observed with the radio spectrometers (1.0–2.0 and 2.6–3.8 GHz) at National Astronomical Observatories of China (NAOC) on 23 September 1998. In combination with the images of Siberian Solar Radio Telescope (SSRT) of Russia, the complex and multiple magnetic structures inferred from the radio bursts reveal the existence of both large-scale and small-scale magnetic structures. This event suggests that the geometries of coronal magnetic fields contain multiple discrete electron acceleration/injection sites at different heights, and extended open and closed magnetic field lines. It can be shown that the energetic electrons gain access to open, diverging and closed field lines thus producing different types of radio bursts. From the characteristics of position, polarization, dispersion and displacement of the sources, the model of the type IV event is supported, which involves synchrotron emission from the electrons confined by the rapid scattering through the interaction of hydromagnetic wave with particles. |
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