Reference : Saturn's equinoctial auroras
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/75383
Saturn's equinoctial auroras
English
Nichols, J. D. [> > > >]
Badman, S. V. [> > > >]
Bunce, E. J. [> > > >]
Clarke, J. T. [> > > >]
Cowley, S. W. H. [> > > >]
Crary, F. J. [> > > >]
Dougherty, M. K. [> > > >]
Gérard, Jean-Claude mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP) >]
Grodent, Denis mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP) >]
Hansen, K. C. [> > > >]
Kurth, W. S. [> >]
Mitchell, D. G. [> > > >]
Pryor, W. R. [> > > >]
Stallard, T. S. [> > > >]
Talboys, D. L. [> > > >]
Wannawichian, S. [> > > >]
2009
Geophysical Research Letters
American Geophysical Union
36
Yes (verified by ORBi)
International
0094-8276
Washington
DC
[en] Saturn ; ultraviolet ; aurora
[en] We present the first images of Saturn's conjugate equinoctial auroras, obtained in early 2009 using the Hubble Space Telescope. We show that the radius of the northern auroral oval is similar to 1.5 degrees smaller than the southern, indicating that Saturn's polar ionospheric magnetic field, measured for the first time in the ionosphere, is similar to 17% larger in the north than the south. Despite this, the total emitted UV power is on average similar to 17% larger in the north than the south, suggesting that field-aligned currents (FACs) are responsible for the emission. Finally, we show that individual auroral features can exhibit distinct hemispheric asymmetries. These observations will provide important context for Cassini observations as Saturn moves from southern to northern summer. Citation: Nichols, J. D., et al. (2009), Saturn's equinoctial auroras, Geophys. Res. Lett., 36, L24102, doi: 10.1029/2009GL041491.
Researchers ; Professionals ; Students
http://hdl.handle.net/2268/75383
also: http://hdl.handle.net/2268/34069
10.1029/2009GL041491

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