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Poster (Scientific congresses and symposiums)
Combined Juno observations and modeling of the Jovian auroral electron interaction with the Jovian upper atmosphere
Gérard, Jean-Claude; Bonfond, Bertrand; Gladstone, G.R. et al.
2018Magnetospheres of Outer Planets
 

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Keywords :
Jupiter; Juno; aurora; electron precipitation; ultraviolet; JEDI
Abstract :
[en] The Juno mission provides a unique opportunity during each perijove pass to sample the downward electron flux at spacecraft altitude while observing far ultraviolet H2 and infrared H3+ emissions at Juno’s magnetic footprint. In addition, the ratio of the H2 spectral band absorbed by hydrocarbons to the unabsorbed portion of the spectrum (FUV color ratio) is often used as a proxy for the depth of the penetration of energetic electrons (relative to the hydrocarbon homopause). The relationship between the color ratio and the electron penetration has been simulated with a Monte Carlo model solving the Boltzmann transport equation. Analysis of concurrent FUV and IR images obtained during the first perijove (PJ1) suggests that the ratio of H3+ radiance to H2 unabsorbed emission is maximal in regions with low FUV color ratio. This result suggests that part of the H3+ column is lost in reactions with methane which converts H3+ into heavier ions. We also examine the observed relationship between the detailed morphology of the ultraviolet structures and of the associated UV color ratio, the total downward electron energy flux and its spectral characteristics.
Research center :
STAR - Space sciences, Technologies and Astrophysics Research - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Gérard, Jean-Claude  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Bonfond, Bertrand  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Gladstone, G.R.
Allegrini, F.
Grodent, Denis  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Greathouse, T.K.
Hue, V.
Versteeg, M.H.
Bolton, S.
Connerney, J.E.P.
Levin, S.M.
Language :
English
Title :
Combined Juno observations and modeling of the Jovian auroral electron interaction with the Jovian upper atmosphere
Publication date :
July 2018
Event name :
Magnetospheres of Outer Planets
Event organizer :
University of Colorado
Event place :
Boulder, United States
Event date :
July 2018
Audience :
International
Funders :
BELSPO - SPP Politique scientifique - Service Public Fédéral de Programmation Politique scientifique
Available on ORBi :
since 30 August 2018

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