The Far-Ultraviolet Spectrum of Mars Observed during the Rosetta Swingby of Mars in February 2007

Details The Far-Ultraviolet Spectrum of Mars Observed during the Rosetta Swingby of Mars in February 2007 The Far-Ultraviolet Spectrum of Mars Observed during the Rosetta Swingby of Mars in February 2007

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.3108f&link_type=abstract

American Astronomical Society, DPS meeting #39, #31.08; Bulletin of the American Astronomical Society, Vol. 39, p.473

Astronomy and Astrophysics

Astronomy

Scientific paper

The European Space Agency's Rosetta spacecraft, en route to comet 67P/Churyumov-Gerasimenko, made a gravity assist encounter with Mars on 25 February 2007, closest approach being at 01:54 UT. The Alice instrument on board Rosetta is a lightweight far-ultraviolet imaging spectrograph optimized for in situ cometary spectroscopy in the 700-2050 A spectral band with a spectral resolution between 8 and 12 A for extended sources that fill its 0.05 degree x 6.0 degree field-of-view. Spatial resolution along the slit is 0.3 degrees. The Mars swingby provided us with the opportunity to study the daytime Mars atmospheric emissions, particularly those below 1200 A that had not previously been observed in situ, and to perform nightside spectral mapping to study the far ultraviolet nightglow and search for signatures of aurora. The observing geometry, first viewing the nearly fully illuminated disk pre-closest approach, followed by observations of the dark disk with a thin solar illuminated crescent after closest approach, allows for a sensitive test of recent upper atmosphere photoexcitation models. Preliminary analyses of the spectra, together with comparisons with previous in situ and remote observations, will be presented.
This work is supported by NASA's Jet Propulsion Laboratory under contract 1200328 to Southwest Research Institute.

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