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An analysis of a solar active region that produced many CMEs

Wang, Min; Xia, Zhi-guo; Zhang, Ba-rong +1 more

In April and May of 1998, six large burst events occurred one after the other in the active region AR8210. We have collected the data of this active region, including its soft X-rays, ultraviolet radiation, radio type-II and -IV bursts as well as its radioheliograph observations. It is found that the process of energy accumulation was rapid and th…

A quantitative research on the classification of coronal mass ejections

Dai, Yu; Zong, Wei-guo; Tang, Yu-hua

It is widely accepted that the properties of coronal mass ejections (CMEs) depend strongly on their structure. Hence it is important, in the study of solar-terrestrial events, to classify CMEs of different morphologies according to intensity. The method of fuzzy comprehensive evaluation can be applied to quantitative research of the CMEs. The memb…

The soft X-ray coronal mass ejection above solar limb of 1998 April 23

Chen, Xiao-juan

Using the observational materials of SXT/HXT aboard satellite Yohkoh and the Nobeyama Radioheliograph (NoRH) on 1998-04-23, a comprehensive study of the soft X-ray coronal mass ejection (CME) above solar SE limb shows that there were two magnetic dipolar sources (MDSs), one magnetic capacity belt (MCB) between the MDSs, one neutral current sheet (…