EDP Sciences
Free access
Volume 437, Number 1, July I 2005
Page(s) 329 - 331
Section Planets and planetary systems
DOI http://dx.doi.org/10.1051/0004-6361:20040257

A&A 437, 329-331 (2005)
DOI: 10.1051/0004-6361:20040257

H $\mathsf{_2}$ vibrational temperatures in the upper atmosphere of Jupiter

M. Barthélemy1, J. Lilensten1 and C. Parkinson2, 3

1  Laboratoire de Planétologie de Grenoble, CNRS - UJF, BP 53, 38041 Saint-Martin-d'Hères, Cedex 9, France
    e-mail: mathieu.barthelemy@ujf-grenoble.fr
2  MS 150-21, Caltech, Pasadena, California, 91125, USA
    e-mail: cdp@gps.caltech.edu
3  MS 183-501, JPL, Pasadena, California, 9110, USA

(Received 12 February 2004 / Accepted 18 March 2005)

The Jovian upper atmosphere has been extensively studied over the past few decades with many observations having been made. Typically, the H2 vibrational temperatures have always been considered as kinetic temperatures in modelling efforts to date. However, recent studies have shown that this assumption is not robust and that we can expect enhanced vibrational temperatures due to overlapping lines to play an important role in the thermosphere of Jupiter. In this paper, we use a radiative transfer code to compute the total integrated H Lyman $\alpha$ dayglow intensity taking into account the overlapping with H2 hot bands. We show that an atmosphere with H2 vibrational temperatures equal to about 1.4 to 1.5 times kinetic reproduce the Voyager observations.

Key words: ultraviolet: solar system -- radiative transfer -- planets and satellites: individual: Jupiter

SIMBAD Objects in preparation

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