ORBi: Bunce E. J. - Origin of Saturn's aurora: Simultaneous observations by Cassini and the Hubble Space Telescope

Reference : Origin of Saturn's aurora: Simultaneous observations by Cassini and the Hubble Space Tel...


	Document type :	Scientific journals : Article
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
	To cite this reference:	http://hdl.handle.net/2268/4553

Title :	Origin of Saturn's aurora: Simultaneous observations by Cassini and the Hubble Space Telescope
Language :	English
Author, co-author :	Bunce, E. J. [> > > >]
	Arridge, C. S. [> > > >]
	Clarke, J. T. [> > > >]
	Coates, A. J. [> > > >]
	Cowley, S. W. H. [> > > >]
	Dougherty, Michele K. [Imperial College of Science and Technology (London) > Blackett Laboratory >]
	Gérard, Jean-Claude [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP) >]
	Grodent, Denis [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP) >]
	Hansen, K. C. [> > > >]
	Nichols, J. D. [> > > >]
	Southwood, D. J. [> > > >]
	Talboys, D. L. [> > > >]
Publication date :	2008
Journal title :	Journal of Geophysical Research
Publisher :	American Geophysical Union
Volume :	113
Issue/season :	A9
Audience :	International
ISSN :	0148-0227
City :	Washington
Country :	DC
Keywords :	[en] Saturn ; auroral phenomena ; main oval
Abstract :	[en] Outer planet auroras have been imaged for more than a decade, yet understanding their physical origin requires simultaneous remote and in situ observations. The first such measurements at Saturn were obtained in January 2007, when the Hubble Space Telescope imaged the ultraviolet aurora, while the Cassini spacecraft crossed field lines connected to the auroral oval in the high-latitude magnetosphere near noon. The Cassini data indicate that the noon aurora lies in the boundary between open- and closed-field lines, where a layer of upward-directed field-aligned current flows whose density requires downward acceleration of magnetospheric electrons sufficient to produce the aurora. These observations indicate that the quasi-continuous main oval is produced by the magnetosphere-solar wind interaction through the shear in rotational flow across the open-closed-field line boundary.
Target :	Researchers ; Professionals ; Students
Permalink :	http://hdl.handle.net/2268/4553
	also: http://hdl.handle.net/2268/29937 ; http://hdl.handle.net/2268/13444
DOI :	10.1029/2008JA013257

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