对日冕物质抛射分类的定量研究

众所周知，日冕物质抛射（CME）的性质强烈地决定于其结构，故对日冕物质抛射的结构进行强度分类，对研究日地事件有重要的意义，利用模糊综合评判方法，可对日冕物质抛射的分类进行定量研究，该方法通常需考虑多个因素，如各类CME的速度、跨度、质量和动能。将其作为评判因素集，并确定相应的隶属度函数，通过计算，可以将CME分成强（strong）、中（middle）、弱（weak）3大类，并根据隶属度值的大小，给出各类CME平均特性的相对强弱排序，分析表明模糊综合评判方法优于一般的统计方法。

QUANTITATIVE RESEARCH OF THE CLASSIFICATION OF CORONAL MASS EJECTIONS

It is widely accepted that the properties of Coronal Mass Ejections (CMEs) depend strongly on their structure. So in the study of solar-terrestrial events, it is very important to classify different morphological CMEs according to intensity. The method of fuzzy comprehensive evaluation, can be applied to the quantitative research of the intensity classification of CMEs. In the application of this method, it is usually required that some factors, CMEs' speed, span, mass and kinetic energy, which were obtained in previous statistic, be selected to form the set of factors. According to the set of factors, membership functions are determined. By data reduction, three CME intensity categories such as strong, middle and weak are obtained. The relative intensity of different morphological CMEs can be also obtained according to the value of membership. The analysis of results shows that the method of fuzzy comprehensive evaluation is better than the method of traditional statistics.