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| Titel |
Inter-hemispheric asymmetries in Saturn’s aurora |
| VerfasserIn |
Sarah Badman, Laurent Lamy, Emma Bunce, Baptiste Cecconi, John Clarke, Frank Crary, Michele Dougherty, Ulyana Dyudina, Joe Kinrade, Bill Kurth, Henrik Melin, Don Mitchell, Jonathan Nichols, Renee Prange, Wayne Pryor, Katerina Radioti, Patricia Schippers, Philippe Zarka |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250151120
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| Publikation (Nr.) |
 EGU/EGU2017-15671.pdf |
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| Zusammenfassung |
| During two intervals in 2016 Saturn’s UV aurorae were observed simultaneously in the northern, summer hemisphere by the Hubble Space Telescope and the southern, winter hemisphere by Cassini. For the first time the full auroral region was visible in both hemispheres allowing the nightside auroral morphology to be examined as well as the dayside. We find significant differences in the relative auroral intensities between the two hemispheres, particularly in the most poleward arcs observed under more active magnetospheric conditions. We propose that these asymmetries could be driven by inter-hemispheric field-aligned currents, or, considering the high latitude extent of some features, in association with enhanced auroral precipitation on newly-reconnected field lines. In the latter scenario, the lifetime of the high latitude auroral feature suggests that enhanced precipitation persists for at least 4 hours, longer than previously estimated, as the arc rotates to the nightside. |
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