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Direct evidence for two-stage (bimodal) acceleration of ionospheric ionsEnergetic ion composition spectrometer data gathered on hybrid conical ion distributions by the Dynamics Explorer 1 in the topside ionosphere are reported. The observed ion distributions were field-aligned and upward flowing, with energies up to 5 keV. Increases in ion energy were accompanied by a departure from field-alignment and a cone patterned upward flow, with the apex in the auroral field lines and the cone angle widening upward as the energy increased. Both transverse and parallel accelerations were imparted to the ions, with the transverse heating occurring in a 5000 km extent region centered at 18,000 km altitude. A bi-Maxwellian distribution, a temperature of 1.2 keV and a 260 eV parallel temperature were found at the top of the region.
Document ID
19850034465
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Klumpar, D. M.
(Texas, University Dallas, TX; Lockheed Space Sciences Laboratory, Palo Alto, CA, United States)
Peterson, W. K.
(Texas Univ. Dallas, TX, United States)
Shelley, E. G.
(Lockheed Space Sciences Laboratory Palo Alto, CA, United States)
Date Acquired
August 12, 2013
Publication Date
December 1, 1984
Publication Information
Publication: Journal of Geophysical Research
Volume: 89
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
85A16616
Funding Number(s)
CONTRACT_GRANT: NAS5-25694
Distribution Limits
Public
Copyright
Other

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