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Anisotropic ion heating and parallel O(+) acceleration in regions of rapid E x B convectionA numerical solution to the 20-moment set of transport equations has been found in order to study subauroral ionospheric outflows during periods of enhanced perpendicular ion drifts. The numerical model solves the time-dependent O(+) density, momentum, and both the parallel and perpendicular energy and heat flow equations in the 200-6000 km altitude range. Assuming perpendicular drifts of 3 km/s relative to the neutral atmosphere, we have found that anisotropic heating of O(+) (a result of ion-neutral collisions) leads to a temperature anisotropy, with perpendicular temperatures exceeding 8000 K and parallel temperatures greater than 5000 K (near 200 km altitude). Above approximately 2000 km, transport processes dominate the effects of collisions and wavelike oscillations in O(+) velocity, temperature and heat flux were noted.
Document ID
19930034861
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Korosmezey, A.
(NASA Headquarters Washington, DC United States)
Rasmussen, C. E.
(NASA Headquarters Washington, DC United States)
Gombosi, T. I.
(NASA Headquarters Washington, DC United States)
Khazanov, G. V.
(Michigan Univ. Ann Arbor, United States)
Date Acquired
August 15, 2013
Publication Date
December 2, 1992
Publication Information
Publication: Geophysical Research Letters
Volume: 19
Issue: 23
ISSN: 0094-8276
Subject Category
Geophysics
Accession Number
93A18858
Funding Number(s)
CONTRACT_GRANT: NSF ATM-91-14409
CONTRACT_GRANT: NAGW-2162
CONTRACT_GRANT: NAGW-1619
Distribution Limits
Public
Copyright
Other

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