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Observations of a nonthermal ion layer at the plasma sheet boundary during substorm recoveryMeasurements 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)
Document ID
19810025909
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Moebius, E.
(Max-Planck-Inst. fuer Physik und Astrophysik Garching, Germany)
Scholer, M.
(Max-Planck-Inst. fuer Physik und Astrophysik Garching, Germany)
Hovestadt, D.
(Max-Planck-Inst. fuer Physik und Astrophysik Garching, Germany)
Klecker, B.
(Max-Planck-Institut fuer Physik und Astrophysik Garching, Germany)
Ipavich, F. M.
(Max-Planck-Inst. fuer Physik und Astrophysik Garching, Germany)
Gloeckler, G.
(Maryland, University College Park, Md., United States)
Date Acquired
August 11, 2013
Publication Date
October 1, 1980
Publication Information
Publication: Journal of Geophysical Research
Volume: 85
Subject Category
Plasma Physics
Accession Number
81A10313
Funding Number(s)
CONTRACT_GRANT: BMFT-RV14-B8/74
CONTRACT_GRANT: NAS5-20062
Distribution Limits
Public
Copyright
Other

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