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Title: Saturn's elusive nightside polar arc
Authors: Radioti, A.
Grodent, D.
Gerard, J-C.
Milan, Stephen Eric
Fear, Robert C.
Jackman, C. M.
Bonfond, B.
Pryor, W.
First Published: 24-Sep-2014
Publisher: American Geophysical Union (AGU)
Citation: Geophysical Research Letters, 2014, 41 (18), pp. 6321-6328 (8)
Abstract: Nightside polar arcs are some of the most puzzling auroral emissions at Earth. They are features which extend from the nightside auroral oval into the open magnetic field line region (polar cap), and they represent optical signatures of magnetotail dynamics. Here we report the first observation of an arc at Saturn, which is attached at the nightside main oval and extends into the polar cap region, resembling a terrestrial transpolar arc. We show that Earth-like polar arcs can exceptionally occur in a fast rotational and internally influenced magnetosphere such as Saturn's. Finally, we discuss the possibility that the polar arc at Saturn is related to tail reconnection and we address the role of solar wind in the magnetotail dynamics at Saturn.
DOI Link: 10.1002/2014GL061081
ISSN: 0094-8276
eISSN: 1944-8007
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2014. American Geophysical Union. All Rights Reserved. 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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