Anisotropic Beam Model for the Spectral Observations of Radio Burst Fine Structures on 1998 April 15  

作　　者：V.G. LedenevE-mail:[e-mail] , Yi-Hua Yan, and Qi-Jun Fu (National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012) (Institute of Solar-Terrestrial Physics, Siberian Division of Russian Academy of Sciences 664033, Irkutsk, P. 0 

出　　处：《Chinese Journal of Astronomy and Astrophysics》2001年第5期475-482,共8页中国天文和天体物理学报（英文版）

基　　金：the Chinese Academy of Sciences.the Ministry of Science and Technology of China(G2000078403);the NSFC Grants:19773016,19833050,19973008,49990451 and Russian Basic Research Foundation(Grant 98-02-17727).

摘　　要：A fine structure consisting of three almost equidistant frequency bands was observed in the high frequency part of a solar burst on 1998 April 15 by the spectrometer of Beijing Astronomical Observatory in the range 2.6-3.8 GHz. A model for this event based on beam-anisotropic instability in the solar corona is presented. Longitudinal plasma waves are excited at cyclotron resonance and then transformed into radio emission at their second harmonic. The model is in accordance with the observations if we suppose a magnetic field strength in the region of emission generation of about 200 G.A fine structure consisting of three almost equidistant frequency bands was observed in the high frequency part of a solar burst on 1998 April 15 by the spectrometer of Beijing Astronomical Observatory in the range 2.6-3.8 GHz. A model for this event based on beam-anisotropic instability in the solar corona is presented. Longitudinal plasma waves are excited at cyclotron resonance and then transformed into radio emission at their second harmonic. The model is in accordance with the observations if we suppose a magnetic field strength in the region of emission generation of about 200 G.

关 键 词：Sun: radio radiation Sun: activity - Sun: corona 

分 类 号：P141.5[天文地球—天体物理]