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| Titel |
The far-ultraviolet main auroral emission at Jupiter – Part 1: Dawn–dusk brightness asymmetries |
| VerfasserIn |
B. Bonfond, J. Gustin, J.-C. Gérard, D. Grodent, A. Radioti, B. Palmaerts, S. V. Badman, K. K. Khurana, C. Tao |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 33, no. 10 ; Nr. 33, no. 10 (2015-10-01), S.1203-1209 |
| Datensatznummer |
250121252
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| Publikation (Nr.) |
 copernicus.org/angeo-33-1203-2015.pdf |
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| Zusammenfassung |
| The main auroral emission at Jupiter generally appears as a quasi-closed
curtain centered around the magnetic pole. This auroral feature, which
accounts for approximately half of the total power emitted by the aurorae in
the ultraviolet range, is related to corotation enforcement currents in the
middle magnetosphere. Early models for these currents assumed axisymmetry,
but significant local time variability is obvious on any image of the Jovian
aurorae. Here we use far-UV images from the Hubble Space Telescope to further
characterize these variations on a statistical basis. We show that the dusk
side sector is ~ 3 times brighter than the dawn side in the southern
hemisphere and ~ 1.1 brighter in the northern hemisphere, where the
magnetic anomaly complicates the interpretation of the measurements. We
suggest that such an asymmetry between the dawn and the dusk sectors could be
the result of a partial ring current in the nightside
magnetosphere. |
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