Energetic magnetosheath ions connected to the Earth's bow shock: Possible source of cusp energetic ions

S.-W. Chang, J. D. Scudder, J. F. Fennell, R. Friedel, R. P. Lepping, C. T. Russell, K. J. Trattner, S. A. Fuselier, W. K. Peterson, and H. E. Spence

Department of Physics and Astronomy, University of Iowa, Iowa City, Iowa


Plasma and magnetic field data detected by NASA GGS/Polar and Wind during the May 4, 1998, storm event are analyzed to demonstrate for the first time a causal relation between the magnetosheath energetic ions and bow shock magnetic geometry. Intense magnetosheath energetic ions observed upstream from the cusp are from the quasi-parallel bow shock and show properties indicating that they are a possible source of cusp energetic ions.

J. Geophys. Res., Vol. 105, No A3, 5471-5488, 2000.