Dynamic auroral storms on Saturn as observed by the Hubble Space Telescope..pdf (3.98 MB)
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journal contribution
posted on 2015-09-22, 10:49 authored by Jonathan D. Nichols, S. V. Badman, K. H. Baines, R. H. Brown, E. J. Bunce, J. T. Clarke, S. W. Cowley, F. J. Crary, M. K. Dougherty, J. C. Gérard, A. Grocott, D. Grodent, W. S. Kurth, H. Melin, D. G. Mitchell, W. R. Pryor, T. S. StallardWe 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.
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Citation
Geophysical Research Letters, 2014, 41 (10), pp. 3323-3330Author affiliation
/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and AstronomyVersion
- VoR (Version of Record)