Search for Origin of Supersonic Turbulence Observed in the Upper Equatorial Atmosphere of Jupiter

Details Search for Origin of Supersonic Turbulence Observed in the Upper Equatorial Atmosphere of Jupiter Search for Origin of Supersonic Turbulence Observed in the Upper Equatorial Atmosphere of Jupiter

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8108e&link_type=abstract

HST Proposal ID #8108

Physics

Hst Proposal Id #8108 Solar System

Scientific paper

It is now clear that Jupiter, like the Sun, sustains a coronal region at the top of its atmosphere. H-Ly-alpha spectra measured by GHRS in the Jovian Ly-alpha bulge region, evidenced a non thermal line broadening, implying supersonic atomic motions and variability on a time scale of about one minute. Such an atmospheric turbulence was suggested by Ben Jaffel et al. 1993 to explain the Jovian Ly-alpha bulge by an enhancement of the H-Ly-alpha resonance cross-section rather than by a local increase of t he H density. Sommeria et al. 1995 proposed then a model of thermospheric circulation reproducing the main characteristics of the bulge and explaining the heating excess observed in the Jovian upper atmosphere. This temperature excess was also explained b y Yelle {1996} invoking heating from gravitational waves dissipation. To put new constraints on these models, and to find out potential alternative explanations, we propose to use STIS to make high-resolution H-Ly-alpha li ne profile maps in four cruci al regions of the planet. Recent cycle 7 STIS auroral observations of J. Clarke et al., demonstrated its capability to provide a wealth of new information on spatial, spectral and scale height distributions, allowing to refine our understanding of the phy si cal processes that drive this highly perturbed region of the Jovian atmosphere, using only a few HST orbits.

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