Saturn's Auroral Energy Deposition Coordinated with Cassini UVIS

Details Saturn's Auroral Energy Deposition Coordinated with Cassini UVIS Saturn's Auroral Energy Deposition Coordinated with Cassini UVIS

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10156c&link_type=abstract

HST Proposal ID #10156

Computer Science

Hst Proposal Id #10156 Solar System

Scientific paper

An in-depth study of Saturn's magnetosphere and auroral processes has begun in Jan. 2004 with coordinated HST STIS images of Saturn's aurora while the approaching Cassini measures the solar wind. This program is expected to establish the degree of solar wind control of Saturn's aurora. The beginning of the Cassini orbiter tour of the Saturn system in July 2004 will offer new opportunities for collaborative science. The energetics of Saturn's auroral processes can best be studied via low resolution UV spectra of the emissions and the auroral "color ratio". The geometry of the initial Cassini orbits provides the best observing geometry for UVIS measurements of auroral energetics when it is close to Saturn on the night side. At such times, it will be possible to have simultaneous observations of Saturn's southern / dayside aurora with HST STIS and the northern / nightside aurora with Cassini UVIS. Both the distributions of the auroral emissions and the energy of the precipitating particles can be measured simultaneously at conjugate points north and south. This proposal is to conduct one such simultaneous observation, which will demonstrate the potential for future cycles. We request 5 HST orbits to observe a large fraction of one complete Saturn rotation at the same time as Cassini UVIS. The rotational coverage has been shown to be of central importance in recent STIS images of Saturn's auroral activity, which is concentrated in an "active sector" connected with the strongest SKR radio emissions.

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