UNSPECIFIED. (1997) First polar and 1995-034 observations of the midaltitude cusp during a persistent northward IMF condition. GEOPHYSICAL RESEARCH LETTERS, 24 (12). pp. 1475-1478. ISSN 0094-8276

Abstract

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 similar to 1.25 x 10(6) K. The combined spacecraft observations show an extended cusp-like region, probably produced by northward IMF.

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