Magnetic reconnection is a main process converting the magnetic energy into thermal and kinetic energy in plasmas. It is one of the fundamental problems of crucial importance not only to space plasmas physics and space weather studies,such as the solar flare,coronal mass ejections and magnetospheric substorms,but also to the stability analysis in magnetically confined fusion. In general,except for cases with periodical boundary conditions,three-dimensional(3D) magnetic re-connection occurs on magnetic separatrices generated by magnetic nulls. Here we briefly introduce/review the theories and some recent satellite observations of 3D magnetic reconnection. Topics to be further studied are also discussed.
目前观测得到的日冕物质抛射(coronal mass ejection,CME)只是其在天空平面的投影,其观测参量与真实参量之间存在一定的差异。而CME的速度是对其地磁效应有决定性影响的参量,因此对CME测量速度作投影效应改正是一个重要的研究课题。综述了近年来对CME测量速度进行投影效应改正的方法,并指出了这些投影效应改正方法中存在的一些问题和进一步的研究方向。
利用Carte Synoptique solar filament archive的暗条观测资料研究了高纬度太阳活动的纬度漂移.定量分析了高纬度活动的两种漂移:已知的太阳活动从中纬度(40°)向太阳两极的纬度漂移,以及新发现的从太阳两极向太阳中纬度的纬度漂移.在一个太阳活动周内从中纬度向太阳两极的纬度漂移的时间(约4.4a)比从太阳两极向太阳中纬度的纬度漂移的时间(约6.6a)要短约2.2a,这两种漂移的转换发生在太阳活动的极大期.将来,太阳活动发电机理论要考虑这种从太阳两极向太阳中纬度的纬度漂移.太阳活动延伸周是从太阳两极向太阳赤道的连续纬度漂移活动周的一部分.
