High Resolution Lyman-α Mapping of the Jovian Upper Atmopshere and Corona

Details High Resolution Lyman-α Mapping of the Jovian Upper Atmopshere and Corona High Resolution Lyman-α Mapping of the Jovian Upper Atmopshere and Corona

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dps....42.1113b&link_type=abstract

American Astronomical Society, DPS meeting #42, #11.13; Bulletin of the American Astronomical Society, Vol. 42, p.1019

Astronomy and Astrophysics

Astronomy

Scientific paper

Owing to the particular capabilities of the HST/STIS spectro-imaging instrument, Jovian H-Lyman-α line profiles were obtained with unprecedented accuracy on different locations of the planetary disc, using the 52"x0.5” long slit in the echelle mode. This mode is allowed by STSCI but not supported for calibration because of potential contamination from adjacent orders. In addition, the telescope pointing to any selected location on the planetary disc is not very accurate for a moving and extended target. The construction of a sophisticated pipeline of calibration was thus necessary to correct for all potential image distortion, signal contamination, and mapping of the slit image over the apparent disc of the planet.
These efforts represent the necessary step for checking the serendipitous discovery of supersonic turbulence in the Jovian Lyman-α bulge and the consequent thermospheric circulation proposed in the literature, including strong winds (up to 20 km/s) predicted in the upper layers (altitudes above the 1 nanobar pressure level) of the atmosphere (Sommeria, Ben-Jaffel, and Prangé, Icarus, 118, pp 2-24, 1995).
A two-dimensional Lyman-α map of the Jovian atmosphere and its corona, corrected for all potential contamination, will be presented with a preliminary analysis, confirming our previous finding of 60 km/s fast rotating hot hydrogen belt at equatorial latitudes.

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