Statistical study of the effect of ULF fluctuations in the IMF on the cross polar cap potential drop for northward IMF,
Kim, H. J., L. Lyons, A. Boudouridis, V. Pilipenko, A. J. Ridley, J. M. Weygand (2011),
J. Geophys. Res., 116 p. A10311,
10.1029/2011ja016931.