supported by the N ational Natural Science Foundation of China major program(Grant No.40390152);the State Key Basic Research Program(Grant No.G200000784);the XK 100010404 of Beijing City;the Space Weather Laboratory;Center for Space Science and Applied Research.CAS.
When the IMF turns southward, a great amount of magnetic energy is stored in the magnetotail, and the electric field across the magnetotail substantially en-hances. As long as magnetic reconnection (MR) in the mag-net...