Article (Scientific journals)
The auroral footprint of Ganymede
Grodent, Denis; Bonfond, Bertrand; Radioti, Aikaterini et al.
2009In Journal of Geophysical Research. Space Physics, 114 (A07212)
Peer Reviewed verified by ORBi
 

Files


Full Text
grodent_2009_2009JA014289.pdf
Publisher postprint (377.91 kB)
Request a copy

All documents in ORBi are protected by a user license.

Send to



Details



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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Grodent, Denis  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Bonfond, Bertrand  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Radioti, Aikaterini ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Gérard, Jean-Claude  ;  Université de Liège - ULiège > 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
Language :
English
Title :
The auroral footprint of Ganymede
Alternative titles :
[fr] L'empreinte aurorale de Ganymede
Publication date :
10 July 2009
Journal title :
Journal of Geophysical Research. Space Physics
ISSN :
2169-9380
eISSN :
2169-9402
Publisher :
American Geophysical Union (AGU), Washington, United States - District of Columbia
Volume :
114
Issue :
A07212
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
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.
Available on ORBi :
since 08 May 2009

Statistics


Number of views
106 (50 by ULiège)
Number of downloads
9 (9 by ULiège)

Scopus citations®
 
39
Scopus citations®
without self-citations
15
OpenCitations
 
38

Bibliography


Similar publications



Contact ORBi