Equatorward diffuse auroral emissions at Jupiter: Simultaneous HST and Galileo observations

A. Radioti; A. T. Tomas; D. Grodent; J. -C. Gerard; J. Gustin; B. Bonford; N. Krupp; J. Woch; J. D. Menietti

doi:10.1029/2009GL037857

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Equatorward diffuse auroral emissions at Jupiter: Simultaneous HST and Galileo observations

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Equatorward diffuse auroral emissions at Jupiter: Simultaneous HST and Galileo observations

A. Radioti, A. T. Tomas, D. Grodent, J. -C. Gerard, J. Gustin, B. Bonford, N. Krupp, J. Woch and J. D. Menietti

Geophysical research letters, Vol.36(7), pp.L07101-n/a

04/16/2009

DOI: 10.1029/2009GL037857

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Abstract

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. Citation: Radioti, A., A. T. Tomas, D. Grodent, J.-C. Gerard, J. Gustin, B. Bonfond, N. Krupp, J. Woch, and J. D. Menietti (2009), Equatorward diffuse auroral emissions at Jupiter: Simultaneous HST and Galileo observations, Geophys. Res. Lett., 36, L07101, doi:10.1029/2009GL037857.

Geology

Geosciences, Multidisciplinary

Physical Sciences

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Details

Title: Subtitle: Equatorward diffuse auroral emissions at Jupiter: Simultaneous HST and Galileo observations
Creators: A. Radioti - University of Liège
A. T. Tomas - GFZ Helmholtz Centre for Geosciences
D. Grodent - University of Liège
J. -C. Gerard - University of Liège
J. Gustin - University of Liège
B. Bonford - University of Liège
N. Krupp - Max Planck Institute for Solar System Research
J. Woch - Max Planck Institute for Solar System Research
J. D. Menietti - University of Iowa
Resource Type: Journal article
Publication Details: Geophysical research letters, Vol.36(7), pp.L07101-n/a
DOI: 10.1029/2009GL037857
ISSN: 0094-8276
eISSN: 1944-8007
Publisher: Amer Geophysical Union
Number of pages: 5
Grant note: European Space Agency; European Commission Belgian Fund for Scientific Research (FNRS); Fonds de la Recherche Scientifique - FNRS NAS5-26555 / AURA, inc.
Language: English
Date published: 04/16/2009
Academic Unit: Physics and Astronomy
Record Identifier: 9984627189902771

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