supported by the KIP Pilot Project of the Chinese Academy of Scineces(KZCX2-YW-123);the National Natural Science Foundation of China (41004072,41031065,41074106,41074117,40974090,40874088 and 40831061);the National Basic Research Program of China(2011CB811405)
It is believed that a southward interplanetary magnetic field (IMF) is mainly responsible for the energy input from solar wind into the magnetosphere.This paper presents an unusual case of strong anti-sunward plasma f...