Fig. 1From: Strong induction effects during the substorm on 27 August 2001The variation of IMF B Z , AE, U PC , Ψ 1, and I R1 during the 27 August 2001 substorm. From top to bottom: IMF B Z, the AE index, the variable polar cap magnetic flux Ψ 1, the cross polar cap potential drop U PC, and the region 1 FAC intensity I R1 vs. UTBack to article page