中文摘要：

多重磁云是行星际空间中的一类特殊的复杂抛射结构.它们是由于日冕物质抛射（CME）相互追赶、相互作用形成的,具有显著的地球空间环境效应.自从我们于2002年发现并确认了第一个多重磁云事件后,国际上对此开展了大量的研究.本文简要回顾多重磁云的相关研究工作和取得的成果,并分析研究过程中遇到的问题和瓶颈,最后对行星际动力学以及空间科学的发展进行展望.

英文摘要：

Multiple magnetic clouds are a particular complex structure in interplanetary space.They are formed due to the chase and interaction between successive coronal mass ejections （CME）,and thought to be significantly geoeffective.The multiple-magnetic-cloud structure was first reported in 2002,and lots of relevant research has been carried out since.This paper gives a brief review of research on multiple magnetic clouds,in which the following issues are addressed.① What is the magnetic cloud？ ② What is the multiple-magnetic-cloud structure？ ③ Why do we study the multiple-magnetic-cloud structure？ ④ What is the challenge？