supported by the National Basic Research Program of China(2006CB806305);the National Natural Science Foundation of China(40874088 and 40890163);the Special Fund for Public Welfare Industry(GYHY200806072);State-level Public Welfar Scientific Research Ccourtyard Basic Scentific Research Operation Cost(058904)
Using the east-west geomagnetic disturbance fields observed from stations at mid-latitudes,we investigate the characteristics of field-aligned currents on the nightside during the April 6,2000 superstorm.The results i...