一个引人注目的CME事件与共生现象的分析研究  

A Spectacular Coronal Mass Ejection Event and Associated Phenomena

作　　者：马媛[1] 李春生[2] 宋谦[1] 

机构地区：[1]中国科学院国家天文台云南天文台,云南昆明650011 [2]南京大学天文系,南京210008

出　　处：《云南天文台台刊》2002年第4期10-18,共9页Publications of the Yunnan Observatoty

摘　　要：根据1991年6月15日发生的微波、分米波、米波、十米波等波段内射电爆发以及质子事件、地磁暴等进行了分析研究,认为产生各种物理过程的有效机制和动因是日冕物质抛射而非太阳耀斑。Based on the data taken from S.G.D.and relevant simultaneous observations of solar radio bursts,gamma-ray emissions and geophysical effects on June 15,1991 the relationships among these phenomena are discussed in this paper.In the observation records of Yunnan Observatory, a spike-Ⅲ burst happened on the metric waveband at 063730UT.The type-Ⅲ burst took place within the waveband of 230-250MHz and showed an evident frequency-drift at both positive and negative directions.Within 230-250MHz the drift rate was-46MHz/s and on the waveband beyond 250MHz the drift was positive and the rate was 65MHz/s.Regarding to the Tarnstrom and Philips classification,the drift rate was moderate.There were millisecond spikes around the waveband of 271-281MHz and they became a type-Ⅲ burst when developing into the waveband beyond 282MHz.The spikes and type-Ⅲ burst corresponded with an X12/3B grade flare that started form 0633UT,maximum at 0831UT,ended at 1117UT and was one of the 6 great flares happened in the AR6659.The metric spikes-Ⅲ burst happened in the rise phase of the flare.Through the analyses it is considered that proton events and GLE events occurred on June 15 in 1991,which were the geophysic responses caused by CME(V≥750km/s).Simultaneous observation of the bursts at the centimetric and decimetric wavelengths can obtain the U-shape spectrum of speak fluxes,which is still one of the effective tools for predicting proton events and its production mechanism can be explained by using the acceleration of the direct current field parallel to the magnetic field in the electric current sheet formed in the process of the production of spray prominences.However,the process in which electrons are accelerated up to the high energy state remains to be explained.The whole event of June 15 1991, form the coronal matter ejection (or the spray prominences in active regions) to the production of various geophysic effects,has explained and verified.

关 键 词：CME事件 日冕物质抛射 太阳射电爆发 γ-射线辐射 地球物理效应 

分 类 号：P182.24[天文地球—天文学] P182