ORBi: Grodent Denis - The auroral footprint of Ganymede

Reference : The auroral footprint of Ganymede


	Document type :	Scientific journals : Article
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
	To cite this reference:	http://hdl.handle.net/2268/12479

Title :	The auroral footprint of Ganymede
Language :	English
Alternative title :	[fr] L'empreinte aurorale de Ganymede
Author, co-author :	Grodent, Denis [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP) >]
	Bonfond, Bertrand [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP) >]
	Radioti, Aikaterini [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP) >]
	Gérard, Jean-Claude [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP) >]
	Jia, Xianzhe [University of California, Los Angeles - UCLA > IGPP > > >]
	Nichols, Jonathan D. [University of Leicester > DPA > > >]
	Clarke, John T. [Boston University > CSP > > >]
Publication date :	10-Jul-2009
Journal title :	Journal of Geophysical Research - Space Physics
Publisher :	American Geophysical Union (AGU)
Volume :	114
Issue/season :	A07212
Audience :	International
ISSN :	0148-0227
City :	Washington
Country :	DC
Abstract :	[en] The interaction of Ganymede with Jupiter's fast rotating magnetospheric plasma gives rise to a current system producing an auroral footprint in Jupiter's ionosphere, usually referred to as the Ganymede footprint. Based on an analysis of ultraviolet images obtained with the Hubble Space Telescope we demonstrate that the auroral footprint surface matches a circular region in Ganymede's orbital plane having a diameter of 8 to 20 RG. Temporal analysis of the auroral power of Ganymede's footprint reveals variations of different timescales: 1) a 5 hours timescale associated with the periodic flapping of Jupiter's plasma sheet over Ganymede, 2) a 10 to 40 minutes timescale possibly associated with energetic magnetospheric events, such as plasma injections, and 3) a 100 s timescale corresponding to quasi-periodic fluctuations which might relate to bursty reconnections on Ganymede's magnetopause and/or to the recurrent presence of acceleration structures above Jupiter's atmosphere. These three temporal components produce an auroral power emitted at Ganymede's footprint of the order of ~0.2 GW to ~1.5 GW.
Funders :	Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
Target :	Researchers ; Professionals ; Students
Permalink :	http://hdl.handle.net/2268/12479
DOI :	10.1029/2009JA014289
Other URL :	http://dx.doi.org/10.1029/2009JA014289
Commentary :	Accepted for publication in the Journal of Geophysical Research. Copyright (2009) American Geophysical Union. Further reproduction or electronic distribution is not permitted. Grodent, D., B. Bonfond, A. Radioti, J.-C. Gérard, X. Jia, J.D. Nichols, J.T. Clarke (2009), The auroral footprint of Ganymede, J. Geophys. Res., doi:10.1029/2009JA014289. To view the published open abstract, go to http://dx.doi.org and enter the DOI.

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