DPS Pasadena Meeting 2000, 23-27 October 2000
Session 12. Outer Planets Posters II - Chemistry, Thermal, Structure and Magnetospheres
Displayed, 1:00pm, Monday - 1:00pm, Friday, Highlighted Tuesday and Thursday, 3:30-6:30pm, C101-C105, C211

[Previous] | [Session 12] | [Next]

[12.04] HST/STIS Observations of a Dawn Auroral Storm on Jupiter

J.T. Clarke (Univ. Michigan), R. Gladstone (SwRI), W. Pryor (Univ. Colorado), J. Ajello (JPL), L. Ben Jaffel (IAP, France), J. Connerney (NASA/GSFC), J.C. Gerard (Univ. Liege), J. Trauger (JPL), H. Waite (Univ. Michigan)

The HST/STIS recorded a detailed time series of images and spectra of the UV emissions from a dawn auroral storm on Jupiter on 21 Sept. 1999. The images show complex and evolving fine structure in the storm, while the emission center remained along the main oval and near dawn in magnetic local time. We serendipitously recorded low resolution UV spectra of the north-south spatial distribution of the auroral emissions. These spectra show far stronger hydrocarbon absorptions than observed in any previous auroral spectra. This indicates an unusually deep penetration of the incident primary particles with respect to the neutral atmosphere, and correspondingly high energy of the primary particles. We can thus use these spectra to identify many complex hydrocarbons in Jupiter's auroral atmosphere which are not normally measured in auroral spectra. These results will be presented along with model fits to the spectra derived both from fitting the observed hydrocarbon absorption features and from comparison with a photochemical model for the expected composition of the auroral atmosphere.

This research has been supported by grant GO-8171.01-97A from the Space Telescope Science Institute to the University of Michigan.

If you would like more information about this abstract, please follow the link to http://aoss.engin.umich.edu/pass/. This link was provided by the author. When you follow it, you will leave the Web site for this meeting; to return, you should use the Back comand on your browser.

[Previous] | [Session 12] | [Next]