Article (Scientific journals)
Spatially resolved far ultraviolet spectroscopy of the jovian aurora
Gustin, Jacques; Grodent, Denis; Gérard, Jean-Claude et al.
2002In Icarus, 157 (1), p. 91-103
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Keywords :
aurora; Jupiter; spectroscopy; ultraviolet observations; Hubble; ultraviolet SPECTRA
Abstract :
[en] Spatially resolved spectra in four 50-Angstrom FUV spectral windows were obtained across the jovian aurora with the Space Telescope Imaging Spectrograph (STIS) on board the Hubble Space Telescope. Nearly simultaneous ultraviolet imaging makes it possible to correlate the intensity variations along the STIS slit with those observed in the images and to characterize the global auroral context prevailing at the time of the observations. Spectra at similar to1-Angstrom resolution taken in pairs included an unabsorbed window and a spectral region affected by hydrocarbon absorption. Both sets of spectra correspond to an aurora with a main oval brightness of about 130 kilorayleighs of H-2 emission. The far ultraviolet color ratios I(1550-1620 Angstrom)/I(1230-1300 Angstrom) are 2.3 and 5.9 for the noon and morning sectors of the main oval, respectively. We use an interactive model coupling the energy degradation of incoming energetic electrons, auroral temperature and composition, and synthetic H2 spectra to fit the intensity distribution of the H2 lines. It is found that the model best fitting globally the spectra has a soft energy component in addition to a 10 erg cm(-2) s(-1) flux of 80 keV electrons. It provides an effective H2 temperature of 540 K. The relative intensity of temperature-sensitive H-2 lines indicates differences between the auroral main oval and polar cap emissions. The amount of methane absorption across the polar region is shown to vary in a way consistent with temperature. For the second spectral pair, the polar cap shows a higher attenuation by CH4, indicating a harder precipitation along high-latitude magnetic field lines. (C) 2002 Elsevier Science (USA).
Disciplines :
Earth sciences & physical geography
Author, co-author :
Gustin, Jacques ;  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.
Clarke, J. T.
Language :
English
Title :
Spatially resolved far ultraviolet spectroscopy of the jovian aurora
Publication date :
May 2002
Journal title :
Icarus
ISSN :
0019-1035
eISSN :
1090-2643
Publisher :
Academic Press Inc Elsevier Science, San Diego, United States - California
Volume :
157
Issue :
1
Pages :
91-103
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 30 January 2009

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