Reference : Quasi-periodic polar flares at Jupiter: A signature of pulsed dayside reconnections?
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/97516
Quasi-periodic polar flares at Jupiter: A signature of pulsed dayside reconnections?
English
Bonfond, Bertrand mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP) > >]
Vogt, M. F. [University of California, Los Angeles - UCLA > Earth and Space Science - ESS > > >]
Gérard, Jean-Claude mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP) > >]
Grodent, Denis mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)]
Radioti, Aikaterini mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP) > >]
Coumans, Valérie mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP) > >]
2011
Geophysical Research Letters
American Geophysical Union
38
02104
Yes
International
0094-8276
Washington
DC
[en] aurora ; flares ; Hubble Space Telescope ; Jupiter ; Magnetospheric Physics: Auroral phenomena (2407) ; Magnetospheric Physics: Cusp ; Magnetospheric Physics: Magnetosphere/ionosphere interactions (2431) ; Planetary Sciences: Fluid Planets: Magnetospheres (2756) ; Planetary Sciences: Solar System Objects: Jupiter ; pulsed reconnection
[en] The most dynamic part of the Jovian UV aurora is located inside the main auroral oval. This region is known to regularly show localized but dramatic enhancements on timescales of several tens of seconds, called polar flares. They have often been associated with the polar cusp, based on their location in the polar cap. The present study is based on the longest high-time resolution image sequences ever acquired by the Space Telescope Imaging Spectrograph aboard the Hubble Space Telescope. We report the first observations of a regularity in the occurrence of these flares, with a timescale of 2-3 minutes. We use a magnetic flux mapping model to identify the region corresponding to these emissions in the equatorial plane: the radial distance ranges from 55 to 120 Jovian radii and the local times are between 10: 00 and 18: 00. The analogy with similar phenomena observed at Earth suggests that these quasi-periodic auroral flares could be related to pulsed reconnections at the dayside magnetopause. Indeed, the flares' projected location in the equatorial plane and their rate of re-occurrence show some similarities with the properties of the flux transfer events observed by the Pioneer and Voyager probes.
Politique Scientifique Fédérale (Belgique) = Belgian Federal Science Policy ; Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
Researchers ; Professionals
http://hdl.handle.net/2268/97516
also: http://hdl.handle.net/2268/87156
10.1029/2010GL045981
http://www.agu.org/pubs/crossref/2011/2010GL045981.shtml

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