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AE-C observations of low-energy particles and ionospheric temperatures in the turbulent polar cusp - Evidence for the Kelvin-Helmholtz instabilityParticle observations at 283 km acquired with the AE-C spacecraft during the large geomagnetic storm of May 16, 1975 indicate that the polar cusp was displaced to 71 deg invariant latitude between 1020 and 1244 MLT. Three regions of low-energy particle fluxes were determined which may be indentified with regions of field-aligned current flow in the dayside auroral zone and cusp. It is suggested that the low-energy electrons are scattered and that their pitch angles are isotropized by magnetic fluctuations associated with the Kelvin-Helmholtz instability caused by shear in the proton flow into the cusp.
Document ID
19780064387
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Potemra, T. A.
(Johns Hopkins Univ. Baltimore, MD, United States)
Bostrom, C. O.
(Johns Hopkins University Applied Physics Laboratory, Laurel, Md., United States)
Doering, J. P.
(Johns Hopkins University Baltimore, Md., United States)
Peterson, W. K.
(Lockheed Missiles and Space Laboratories Palo Alto, Calif., United States)
Hoffman, R. A.
(Johns Hopkins Univ. Baltimore, MD, United States)
Brace, L. H.
(NASA Goddard Space Flight Center Greenbelt, Md., United States)
Date Acquired
August 9, 2013
Publication Date
August 1, 1978
Publication Information
Publication: Journal of Geophysical Research
Volume: 83
Subject Category
Geophysics
Accession Number
78A48296
Funding Number(s)
CONTRACT_GRANT: NAS5-11415
Distribution Limits
Public
Copyright
Other

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