Observations of a nonthermal ion layer at the plasma sheet boundary during substorm recovery

Details Observations of a nonthermal ion layer at the plasma sheet boundary during substorm recovery Observations of a nonthermal ion layer at the plasma sheet boundary during substorm recovery

Oct 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85.5143m&link_type=abstract

Journal of Geophysical Research, vol. 85, Oct. 1, 1980, p. 5143-5148. Bundesministerium für Forschung und Technologie

Physics

6

Alpha Particles, Boundary Layer Plasmas, Geomagnetic Tail, Magnetic Storms, Proton Flux Density, Satellite Observation, Angular Distribution, Energetic Particles, Energy Distribution, Plasma Diagnostics, Plasma Layers

Scientific paper

Measurements of the energy and angular distributions of energetic protons and alpha particles (not less than 30 keV/charge) in the geomagnetic tail are presented. The measurements were made during the recovery phase of a geomagnetic substorm on Apr. 19, 1978, with the Max-Planck-Institut/University of Maryland sensor system on the Isee 1 satellite. The measurements were also correlated with plasma observations made by the LASL/MPE instrument on Isee 1. The data reveal the presence of a thin nonthermal layer of protons and alpha particles at the plasma sheet boundary. The particles have their maximum flux at 60 keV/charge and are streaming highly collimated in the earthward direction. The alpha particle layer is confined within the proton layer. Many aspects of the observations are in agreement with an acceleration model near the neutral line proposed by Jaeger and Speiser (1974)

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