Please use this identifier to cite or link to this item: http://hdl.handle.net/2381/36240
Title: Saturn's northern auroras as observed using the Hubble Space Telescope
Authors: Nichols, Jonathan D.
Badman, S. V.
Bunce, E. J.
Clarke, J. T.
Cowley, Stanley William Herbert
Hunt, G. J.
Provan, G.
First Published: 1-Jan-2016
Publisher: Elsevier for Academic Press Inc.
Citation: Icarus, 2016, 263, pp. 17-31 (15)
Abstract: We discuss the features of Saturn’s northern FUV auroras as observed during a program of Hubble Space Telescope observations which executed over 2011–2013 and culminated, along with Cassini observations, in a comprehensive multi-spectral observing campaign. Our 2011–2013 observations of the northern aurora are also compared with those from our 2007–2008 observation of the southern aurora. We show that the variety of morphologies of the northern auroras is broadly consistent with the southern, and determine the statistical equatorward and poleward boundary locations. We find that our boundaries are overall consistent with previous observations, although a modest poleward displacement of the poleward boundaries is due to the increased prevalence of poleward auroral patches in the noon and afternoon sectors during this program, likely due to the solar wind interaction. We also show that the northern auroral oval oscillates with the northern planetary period oscillation (PPO) phase in an elongated ellipse with semi-major axis ∼1.6° oriented along the post-dawn/post-dusk direction. We further show that the northern auroras exhibit dawn-side brightenings at zero northern magnetic PPO phase, although there is mixed evidence of auroral emissions fixed in the rotating frame of the northern PPO current system, such that overall the dependence of the auroras on northern magnetic phase is somewhat weak.
DOI Link: 10.1016/j.icarus.2015.09.008
ISSN: 0019-1035
Links: http://www.sciencedirect.com/science/article/pii/S001910351500411X
http://hdl.handle.net/2381/36240
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2015, the Authors. Published by Elsevier Inc. This is an open access article under the CC BY license ( http://creativecommons.org/licenses/by/4.0/ ) 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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