DPS Meeting, Madison, October 1998
Session 37. Jupiter III
Contributed Oral Parallel Session, Thursday, October 15, 1998, 9:00-10:30am, Madison Ballroom D

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[37.04] FUV spectroscopy of the H2 emission in the Jovian aurora: model update and results

J. -C. G\'erard, V. Dols, D. Colignon, D. Grodent (LPAP-ULg), J. T. Clarke (SPRL-Michigan), J. H. Waite, G. R. Gladstone (SwRI)

The Jovian aurora exhibits bright emissions mainly due the bright Lyman-alpha line and to radiation from excited singlet states to the ground electronic state extending from 800 to 1600~Å. Above 1200~Å, the molecular spectrum is dominated by the Lyman (B-X)~bands and continuum and the Werner (C-X)~bands. These transitions have been observed with the Goddard High Resolution Spectrometer (GHRS) and the Space Telescope Imaging Spectrometer (STIS) at various spectral and spatial resolutions. To analyze these spectra, a model synthetic auroral spectrum has been constructed and applied to the analysis of the ro-vibrational temperature of H2 and a search for non-H2 emission features. It has been recently updated to include the latest singlet state excitation and cascading cross sections, self-absorption in optically thick lines and to account for the energy distribution of the secondary electrons which cause additional excitation. We illustrate these effects in a few study cases and apply the model to high resolution (0.5~Å) GHRS spectra and low resolution STIS spectra of the entire H2 spectrum at wavelengths longer than Lyman-alpha. We determine the methane column overlying the auroral emission peak and find that a better fit is obtained with additional absorption by acetylene.

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The author(s) of this abstract have provided an email address for comments about the abstract: gerard@astro.ulg.ac.be

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