Computer Science
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf.1254m&link_type=abstract
EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.1254
Computer Science
Scientific paper
We have measured the ionization lifetime of ground state atomic carbon using wide-field far ultra-violet images of comet C/2004 Q2 (Machholz) recorded by the Galaxy Evolution Explorer (GALEX) satellite. The measured lifetime is 7.1 - 9.6×105 s (ionization rate of 1.0 - 1.4×10-6 s-1) when scaled to 1AU. This lifetime is short compared to that calculated for solar photoionization alone, suggesting that solar wind ionization processes contribute significantly, particularly for a comet embedded in the slow solar wind. Preliminary results suggest a similar effect is occurring for CO, which has a calculated photodissociative lifetime of 5×105 s, but which our data suggests lives on the order of 3×105 s.
Combi Michael R.
Feldman Paul D.
Harris Walter M.
Morgenthaler Jeffrey P.
Weaver Harold A.
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