Water Production Rates from SOHO/SWAN H Lyman-alpha Observations of Active and Moderately Active Comets

Details Water Production Rates from SOHO/SWAN H Lyman-alpha Observations of Active and Moderately Active Comets Water Production Rates from SOHO/SWAN H Lyman-alpha Observations of Active and Moderately Active Comets

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.2905c&link_type=abstract

American Astronomical Society, DPS meeting #38, #29.05; Bulletin of the American Astronomical Society, Vol. 38, p.535

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SWAN, the all-sky hydrogen Lyman-alpha camera on the SOHO spacecraft makes routine all-sky images of the interplanetary neutral hydrogen around the sun and thus monitors the effect of the variable solar wind on its distribution. SWAN has an ongoing campaign to make special observations of comets, both short and long period ones, in addition to making serendipitous observations of comets as part of the all-sky monitoring program. We report here on a study of the moderately active comets observed by SWAN during the period of 1999-2004: 1999 H1 Lee, 1999 T1 McNaught Hartley, 2000 WM1 LINEAR, 2001 A2 LINEAR, 2002 C1 Ikeya Zhang, and 2004 Q4 NEAT. SWAN is able to observe comets almost continuously over their whole visible apparition and provide excellent temporal coverage of the gas production. In addition to calculating production rates from each image, we also present some preliminary results using our time-resolved model (TRM) that analyzes an entire sequence of images over many days to several weeks, and from which 1-day or 2-day average water production rates can be extracted over continuous periods of several days to weeks. We also present single image results for comet 1995 O1 Hale-Bopp extending our previous work from 5 months around perihelion to over a year, as well as preliminary results from the TRM.
This work was partially supported by grant NNG05GF06G from the NASA Planetary Astronomy Program. SOHO is a mission of international cooperation between ESA and NASA. SWAN was financed in France by CNES with support from CNRS for staff salaries and in Finland by TEKES and the Finnish Meteorological Institute.

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