Equatorward shift of the cleft during magnetospheric substorms as observed by Isis 1

摘要: Isis 1 satellite observations of the cleft position during magnetospheric substorms show that shifts equatorward as interplanetary B sub z component turns southward and substorm activity increases it back toward higher latitudes subsides returns northward. Also, unusually low for (less than 70 deg invariant latitude) were found geomagnetic storms with significant Dst values large negative values. Significant occur in location no accompanying effect seen AE index; however, is observed to be these periods.