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Title: Dynamic auroral storms on Saturn as observed by the Hubble Space Telescope
Authors: Nichols, Jonathan D.
Badman, S. V.
Baines, K. H.
Brown, R. H.
Bunce, E. J.
Clarke, J. T.
Cowley, S. W.
Crary, F. J.
Dougherty, M. K.
Gérard, J. C.
Grocott, A.
Grodent, D.
Kurth, W. S.
Melin, H.
Mitchell, D. G.
Pryor, W. R.
Stallard, T. S.
First Published: 28-May-2014
Publisher: American Geophysical Union (AGU)
Citation: Geophysical Research Letters, 2014, 41 (10), pp. 3323-3330
Abstract: We present observations of significant dynamics within two UV auroral storms observed on Saturn using the Hubble Space Telescope in April/May 2013. Specifically, we discuss bursts of auroral emission observed at the poleward boundary of a solar wind-induced auroral storm, propagating at ∼330% rigid corotation from near ∼01 h LT toward ∼08 h LT. We suggest that these are indicative of ongoing, bursty reconnection of lobe flux in the magnetotail, providing strong evidence that Saturn's auroral storms are caused by large-scale flux closure. We also discuss the later evolution of a similar storm and show that the emission maps to the trailing region of an energetic neutral atom enhancement. We thus identify the auroral form with the upward field-aligned continuity currents flowing into the associated partial ring current.
DOI Link: 10.1002/2014GL060186
ISSN: 0094-8276
eISSN: 1944-8007
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2014. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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