Physics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufm.p31a0974s&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #P31A-0974
Physics
6008 Composition, 6062 Satellites, 6210 Comets
Scientific paper
During April and May of 2004, the Ultraviolet Imager (UVI) onboard the Polar spacecraft was in the unique position to observe two comets near their perihelion: C/2001 Q4 (NEAT) and C/2002 T7 (LINEAR). Using its suite of four far ultraviolet filters, UVI is able to observe atomic oxygen emissions at 130.4 nm and atomic carbon emissions at 156.1 nm and 165.7 nm. The photon flux is directly related to the production rates for these atoms. From the oxygen and carbon production rates, we are able to estimate the production rates of CO, OH, and water. Initial analysis shows that both comets are very dim in the far ultraviolet and are not easily detected by UVI. We are able to derive upper limits to the production rates. To our knowledge, this is the first report of observations of these comets in the far ultraviolet region.
Fillingim Matthew O.
Parks George K.
Spasojevic Maria
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