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Title: Earth's ion upflow associated with polar cap patches: Global and in situ observations
Authors: Zhang, Qing-He
Zong, Qiu-Gang
Lockwood, Michael
Heelis, Roderick A.
Hairston, Marc
Liang, Jun
McCrea, Ian
Zhang, Bei-Chen
Moen, Jøran
Zhang, Shun-Rong
Zhang, Yong-Liang
Ruohoniemi, J. Michael
Lester, Mark
Thomas, Evan G.
Liu, Rui-Yuan
Dunlop, Malcolm W.
Liu, Yong C.-M.
Ma, Yu-Zhang
First Published: 22-Feb-2016
Publisher: American Geophysical Union (AGU)
Citation: Geophysical Research Letters, 2016, 43 (5), pp. 1845-1853
Abstract: We report simultaneous global monitoring of a patch of ionization and in situ observation of ion upflow at the center of the polar cap region during a geomagnetic storm. Our observations indicate strong fluxes of upwelling O+ ions originating from frictional heating produced by rapid antisunward flow of the plasma patch. The statistical results from the crossings of the central polar cap region by Defense Meteorological Satellite Program F16–F18 from 2010 to 2013 confirm that the field-aligned flow can turn upward when rapid antisunward flows appear, with consequent significant frictional heating of the ions, which overcomes the gravity effect. We suggest that such rapidly moving patches can provide an important source of upwelling ions in a region where downward flows are usually expected. These observations give new insight into the processes of ionosphere-magnetosphere coupling.
DOI Link: 10.1002/2016GL067897
ISSN: 0094-8276
eISSN: 1944-8007
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2016. American Geophysical Union. Further reproduction or electronic distribution is not permitted. Deposited with reference to the publisher’s open access archiving policy.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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