bibliography; planets and satellites: atmospheres; planets and satellites: aurorae; planets and satellites: gaseous planets; publications; Aurorae; Conductance values; Electron energy distributions; Hall conductance; Planet and satellite: aurora; Planet and satellite: gaseous planet; Planets and satellites; Planets and satellites: atmospheres; Publication; Astronomy and Astrophysics; Space and Planetary Science; astro-ph.EP; Physics - Plasma Physics
Abstract :
[en] Context. The ionospheric Pedersen and Hall conductances play an important role in understanding the coupling by which angular momentum, energy, and matter are exchanged between the magnetosphere, ionosphere and thermosphere at Jupiter, modifying the composition and temperature of the planet. In the high-latitude regions, the Pedersen and Hall conductances are enhanced by the auroral electron precipitation. Aims. We investigated the effect of a broadband-precipitating electron energy distribution, similar to the observed electron distributions through particle measurements, on the Pedersen and Hall conductance values. The new conductance values were compared to those obtained from previous studies, notably for a mono-energetic distribution. Methods. The broadband-precipitating electron energy distribution was modeled by a kappa distribution, which is used as an input in an electron transport model that computes the vertical density profiles of ionospheric ions. Assuming that the conductivity is mostly governed by the density of H3+ and CH5+, we then evaluated the vertical profiles of the Pedersen and Hall conductivities from the vertical profiles of the ion density. Finally, the Pedersen and Hall conductances were computed by integrating the corresponding conductivities over altitude. Results. The Pedersen and Hall conductance values are globally higher for a broadband electron energy distribution instead of a mono-energetic distribution. In addition, the considered electron collision cross sections and the chosen method for computing the ion production rates can also have significant impacts on the conductance values. The comparison between our results and those deduced from corotation enforcement theory suggests that either a physical mechanism limits the field-aligned currents or the auroral electrons precipitating in the atmosphere are accelerated by processes that are not associated with the field-aligned currents.
Research Center/Unit :
STAR - Space sciences, Technologies and Astrophysics Research - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Sicorello, Guillaume ; Université de Liège - ULiège > Unités de recherche interfacultaires > Space sciences, Technologies and Astrophysics Research (STAR)
Grodent, Denis ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Bonfond, Bertrand ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Gérard, Jean-Claude ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Benmahi, Bilal ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP) ; Aix-Marseille Université, CNRS, CNES, Institut Origines, LAM, Marseille, France
Salveter, A. ; Institute of Geophysics and Meteorology, University of Cologne, Cologne, Germany
Moirano, Alessandro ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP) ; Institute for Space Astrophysics and Planetology, National Institute for Astrophysics (INAF-IAPS), Rome, Italy
Head, Linus Alexander ; Université de Liège - ULiège > Unités de recherche interfacultaires > Space sciences, Technologies and Astrophysics Research (STAR)
Vinesse, Julie ; Université de Liège - ULiège > Unités de recherche interfacultaires > Space sciences, Technologies and Astrophysics Research (STAR)
Greathouse, T. ; Southwest Research Institute, San Antonio, United States
Gladstone, G.R.; Southwest Research Institute, San Antonio, United States ; Physics and Astronomy Department, University of Texas at San Antonio, United States
Barthélémy, M.; Univ. Grenoble Alpes, CNRS, IPAG, Grenoble, France
Language :
English
Title :
The Pedersen and Hall conductances in the Jovian polar regions: New maps based on a broadband electron energy distribution
F.R.S.-FNRS - Fonds de la Recherche Scientifique NASA - National Aeronautics and Space Administration
Funding text :
This work was supported by the Fonds de la Recherche Scientifique - FNRS under Grant(s) No. T003524F. T. Greathouse was funded by the NASA\u2019s New Frontiers Program for Juno via contract NNM06AA75C with the Southwest Research Institute. B. Bonfond is a Research Associate of the Fonds de la Recherche Scientifique - FNRS.
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