We present the first observations by Polar and 1995-034 of the mid-altitude cusp. On May 29, 1996, the Polar and 1995-034 spacecraft crossed into an extended cusp region. The region was characterized by intense fluxes of solar wind like ions in the energy range 1–10 keV that had angular distributions that showed evidence of flows and trapping. The ion composition data are combined with energetic proton observations from Polar and plasma observations from 1995-034 and DMSP satellites to examine the spatial and temporal extent and plasma characteristics of the cusp during a persistent northward IMF condition. The composition data is consistent with expected solar wind composition with a source temperature of ∼1.25 × 106 K. The combined spacecraft observations show an extended cusp-like region, probably produced by northward IMF
Geophysical Research Letters
American Geophysical Union
Digital Object Identifier (DOI)
Grande, M.; Fennell, J.; Livi, S.; Kellett, B.; Perry, C.; Anderson, P.; Roeder, J.; Spence, Harlan E.; Fritz, T.; and Wilken, B., "First polar and 1995-034 observations of the midaltitude cusp during a persistent northward IMF condition" (1997). Geophysical Research Letters. 298.
Copyright 1997 by the American Geophysical Union.