近地磁尾准无碰撞磁重联事件  

QUASI-COLLISIONLESS MAGNETIC RECONNECTION EVENTS IN THE NEAR-EARTH MAGNETOTAIL

作　　者：周国成[1] 蔡春林[1] 曹晋滨[1] 王德驹[1] HenriReme AndreBalogh 

机构地区：[1]中国科学院空间科学与应用研究中心,北京100080 [2]Centred’Etude spatiale des Ralyonnements [3]The Blachett Laboratory,Imperial college

出　　处：《空间科学学报》2003年第1期25-33,共9页Chinese Journal of Space Science

基　　金：国家自然科学基金(40174042;40074043);国家杰出青年科学基金(40025413);双星重大项目资助

摘　　要：综合分析了ClusterⅡ-C1飞船在2001年9月15日飞越地球磁尾等离子体片区的热离子和磁场观测资料.结果表明,约在0340-0440 UT时间期间,资料多次呈现出较强的尾向离子流(VXGSM<0),明显的南向磁场分量(BZGSM<0),以及明显的晨-昏向磁场分量BYGSM等特征.由此可以推断,在磁尾等离子体片中,在径向方向XGSE>-18.6 Re范围内,可能发生了多次磁重联事件,整个事件持续期约1 h.磁重联事件的观测特征与准无(或半)碰撞磁重联理论的基本图像符合一致,因此这些事件应当是准无碰撞磁重联事件.Hot ion (- 5 eV/e-32 keV/e) and magnetic field data observed by Cluster Ⅱ-C1 CIS/HIS and FGM during the magnetotail plasma sheet crossing on September 15, 2001 are analyzed in this paper. In the interval of 0340-0440 UT, fast tailward ion flows (VXGSM < 0) were observed, which were associated with the enhancements of southward and dusk-downward magnetic fields (BZGSM < 0 and BYGSM < 0 or > 0). It can be inferred from these observations that magnetic reconnection events took place at XGSE > -18.6Re within the plasma sheet in the interval of 0340-0440 UT on September 15, 2001. The characteristics for these events are consistent with the physical pictures of theory for a quasi-collisionless magnetic reconnection. Hence these events should be called as quasi-collisionless magnetic reconnection events.

关 键 词：准无碰撞磁重联事件 ClusterⅡ飞船 磁尾 观测 磁场 

分 类 号：P353[天文地球—空间物理学]