Article (Scientific journals)
Equatorward diffuse auroral emissions at Jupiter: Simultaneous HST and Galileo observations
Radioti, Aikaterini; Tomás, Ana Teresa; Grodent, Denis et al.
2009In Geophysical Research Letters, 36, p. 07101
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Keywords :
Magnetospheric Physics: Auroral phenomena (2407); Magnetospheric Physics: Magnetosphere/ionosphere interactions (2431); Magnetospheric Physics: Energetic particles: precipitating; Magnetospheric Physics: Planetary magnetospheres (5443; 5737; 6033)
Abstract :
[en] We study the auroral emissions equatorward of the main oval based on Hubble Space Telescope (HST) observations of both Jovian hemispheres on September 20, 1997. On the same day, Galileo observed changes in the electron pitch angle distribution between the inner and middle magnetosphere (PAD boundary), indicative of electron diffusion. This region, magnetically maps to the equatorward diffuse emissions on both hemispheres. Whistler mode waves, observed simultaneously, can scatter electrons into the loss cone and lead to electron precipitation in the ionosphere. Based on simultaneous HST FUV and Galileo wave and electron data we test the conditions for electron scattering by whistler mode waves and derive the energy flux precipitated in the ionosphere. The comparison of the derived precipitation energy flux with the observed auroral brightness indicates that the energy contained in the PAD boundary can account for the auroral emissions.
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)
Tomás, Ana Teresa;  GeoForschungZentrum, Potzdam, Germany
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)
Gustin, Jacques ;  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)
Krupp, Norbert;  Max-Planck-Institut fuer Sonnensystemforschung, Katlenburg-Lindau, Germany
Woch, Joachim;  Max-Planck-Institut fuer Sonnensystemforschung, Katlenburg-Lindau, Germany
Menietti, John Douglas;  University of Iowa, Iowa City, USA > Departement pf Physics and Astronomy
Language :
English
Title :
Equatorward diffuse auroral emissions at Jupiter: Simultaneous HST and Galileo observations
Publication date :
02 April 2009
Journal title :
Geophysical Research Letters
ISSN :
0094-8276
eISSN :
1944-8007
Publisher :
American Geophysical Union, Washington, United States - District of Columbia
Volume :
36
Pages :
07101
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 02 September 2009

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