Possible connection of polar cap flows to pre- and post-substorm onset PBIs and streamers,
Lyons, L. R., Y. Nishimura, H.-J. Kim, E. Donovan, V. Angelopoulos, G. Sofko, M. Nicolls, et al. (2011),
J. Geophys. Res., 116 p. A12225,
10.1029/2011JA016850.