A Spectroscopic Tour of the Solar System with FUSE

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Scientific paper

The spectral band, resolution, and sensitivity of FUSE provide a unique capability to study the principal atoms, ions and molecules in a variety of planetary environments. Moving target capability was implemented in mid-2000 and has enabled significant discoveries on the nature of the atmospheres of Mars, Jupiter, Saturn, and four comets, particularly the detection for the first time of H2 in the atmosphere of Mars and in cometary comae. FUSE showed that comets have a very rich spectrum in the far-ultraviolet although nearly half of the observed lines remain unidentified. Sensitive searches for Ar, N2, and O VI have only yielded upper limits to the abundances of these species in cometary comae. Observations of Jovian aurora, which is dominated by electron excited H2 emission, and of the Io plasma torus were made during a mini-campaign at the time of the Cassini closest approach to Jupiter in December 2000. Singly and doubly-ionized chlorine were detected in the torus spectrum and their abundances were quantitatively determined relative to the sulfur ion abundance.

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