Please use this identifier to cite or link to this item: http://hdl.handle.net/2381/36394
Title: Observations of nightside auroral plasma upflows in the F-region and topside ionosphere
Authors: Lester, Mark
Foster, C.
First Published: 31-Dec-1996
Publisher: Copernicus Publications on behalf of the European Geosciences Union
Citation: Annales Geophysicae, 1996, 14, pp. 1274-1283
Abstract: Observations from the special UK EISCAT program UFIS are presented. UFIS is a joint UHF-VHF experiment, designed to make simultaneous measurements of enhanced vertical plasma flows in the F-region and topside ionospheres. Three distinct intervals of upward ion flow were observed. During the first event, upward ion fluxes in excess of 10[Superscript: 13] m[Superscript: –2] s[Superscript: –1 ] were detected, with vertical ion velocities reaching 300 m s[Superscript: –1 ] at 800 km. The upflow was associated with the passage of an auroral arc through the radar field of view. In the F-region, an enhanced and sheared convection electric field on the leading edge of the arc resulted in heating of the ions, whilst at higher altitudes, above the precipitation region, strongly enhanced electron temperatures were observed; such features are commonly associated with the generation of plasma upflows. These observations demonstrate some of the acceleration mechanisms which can exist within the small-scale structure of an auroral arc. A later upflow event was associated with enhanced electron temperatures and only a moderate convection electric field, with no indication of significantly elevated ion tem- peratures. There was again some evidence of F-region particle precipitation at the time of the upflow, which exhibited vertical ion velocities of similar magnitude to the earlier upflow, suggesting that the behaviour of the electrons might be the dominant factor in this type of event. A third upflow was detected at altitudes above the observing range of the UHF radar, but which was evident in the VHF data from 600 km upwards. Smaller vertical velocities were observed in this event, which was apparently uncorrelated with any features observed at lower altitudes. Limitations imposed by the experimental conditions inhibit the interpretation of this event, although the upflow was again likely related to topside plasma heating.
DOI Link: 10.1007/s00585-996-1274-1
ISSN: 0992-7689
eISSN: 1432-0576
Links: http://www.ann-geophys.net/14/1274/1996/
http://hdl.handle.net/2381/36394
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 1996, European Geosciences Union. This is an open-access article distributed under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/3.0/ ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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