Relations Between Coronal Mass Ejection and Solar Act ivity as Well as Its Active Cycle

Coronal mass ejecton (CME) has been an active topic in solar physics since 1970s. The following aspects of the CME study are given systematically in this thesis: importance, contents, method and results obtained. The relations between the CME and flare as well as its activecycle are further studied. The results of the study are given as follows: 1) there is no positive relation directly between the CMEs and solar flares, but both of them may be in interaction under some conditions; 2) Energy related to the CME in other activity may bear a relation to velocity of the CME. It is shown from the velocity distribution of the CME that the faster ejective mass moves, the higher the energy associated to the activity is; 3) The active type related to the CME is change with the solar active cycle, these activities related with mass ejection are mainly solar flares that give higher energy during the solar maximum years, but in the solar minimum years the activities are eruptive prominences in which lower energy is released. Some CME events observed in February 1989 are studied in detail. It is found from the study that distribution of CMEs in longitude is inhomogeneous, and there are three longitude zones where the mass ejections concentrate in. We also research on the relation between structure pattern of CMEs and the related activities, and it is found that there are two models for the activities of flare and active prominence on the disk and the CMEs: for one model, the activity happens before the CME, it may be responsible for the CME; for another model, the activity takes place after the CME and perhaps it is caused by the CME. They are different in active type and appeared position related to the CME. A point of view of taking coronal current as a source of CME is proposed at last based on a research of CME source and a preliminary discussion for the present model of CMEs is given as well.