Search Publications
Automatic Coronagraph Image Classification with Machine Learning Methods
Zhang, Yan; Feng, Li; Li, Hui +5 more
The detection of Coronal Mass Ejections (CMEs) is an important prerequisite for establishing a CME event database and realizing the prediction of CME interplanetary propagation. The Lyman-alpha Solar Telescope (LST) aboard the ASO-S (Advanced Space-based Solar Observatory) satellite will be equipped with a white-light coronagraph. The images with …
Study of the Streamer Current Sheet with White-Light and UV Observations
Feng, Li; Li, Hui; Shi, Guang-lu +2 more
Current sheets (CSs) are the main region where magnetic reconnections can convert magnetic energy into plasma thermal and kinetic energies. We have studied a CS in the streamer occurred on 3 January 2003 by combining the White-Light (WL) images observed by the Large Angle and Spectrometric Coronagraph (LASCO) and the EUV spectra detected by the Ul…
Fuzzy set theory applied to CME importance classification
Han, Zheng-Zhong; Tang, Yu-Hua
In this paper, fuzzy set theory is applied to a quantitative way of assigning importance class to coronal mass ejection (CME) events based on four observed characteristics, i.e. velocity, span, mass and kinetic energy. The weights to be associated with each of the characteristics and the membership functions of belonging to one of the three import…
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 (…