Article (Scientific journals)
Nightside reconnection at Jupiter: Auroral and magnetic field observations from 26 July 1998
Radioti, Aikaterini; Grodent, Denis; Gérard, Jean-Claude et al.
2011In Journal of Geophysical Research. Space Physics, 116, p. 03221
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Keywords :
Magnetospheric Physics: Auroral phenomena (2407); Magnetospheric Physics: Magnetic reconnection (7526; 7835); Magnetospheric Physics: Field-aligned currents and current systems (2409); Magnetospheric Physics: Magnetosphere/ionosphere interactions (2431); Magnetospheric Physics: Instruments and techniques
Abstract :
[en] In this study we present ultraviolet and infrared auroral data from 26 July 1998, and we show the presence of transient auroral polar spots observed throughout the postdusk to predawn local time sector. The polar dawn spots, which are transient polar features observed in the dawn sector poleward of the main emission, were previously associated with the inward moving flow resulting from tail reconnection. In the present study we suggest that nightside spots, which are polar features observed close to the midnight sector, are related to inward moving flow, like the polar dawn spots. We base our conclusions on the near-simultaneous set of Hubble Space Telescope (HST) and Galileo observations of 26 July 1998, during which HST observed a nightside spot magnetically mapped close to the location of an inward moving flow detected by Galileo on the same day. We derive the emitted power from magnetic field measurements along the observed plasma flow bubble, and we show that it matches the emitted power inferred from HST. Additionally, this study reports for the first time a bright polar spot in the infrared, which could be a possible signature of tail reconnection. The spot appears within an interval of 30 min from the ultraviolet, poleward of the main emission on the ionosphere and in the postdusk sector planetward of the tail reconnection x line on the equatorial plane. Finally, the present work demonstrates that ionospheric signatures of flow bursts released during tail reconnection are instantaneously detected over a wide local time sector.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Radioti, Aikaterini ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Grodent, Denis  ;  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)
Vogt, M. F.
Lystrup, M.;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Bonfond, Bertrand  
Language :
English
Title :
Nightside reconnection at Jupiter: Auroral and magnetic field observations from 26 July 1998
Publication date :
2011
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 :
116
Pages :
03221
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 22 August 2011

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