Abstract
The energy spectra and anisotropies of protons and alpha particles have been investigated at the plasmasheet boundary during the recovery phase of geomagnetic substorms using the Max-Planck-Institut/University of Maryland sensor system on the ISEE-1 satellite [1]. The observations reveal the presence of a thin nonthermal layer of ∼60 keV/charge protons and alpha particles at the plasmasheet boundary, the particles streaming highly collimated in earthward direction. The alpha particle layer is confined within the proton layer. The main features of the layers can be explained in terms of an acceleration model proposed by Speiser [2] for the environment of a magnetic neutral line.
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