Lyman-alpha observations of comet 46 P/Wirtanen with swan on SOHO: H2O production rate near 1997 perihelion |
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| Institution: | 1. Service dAéronomie, BP 3, 91371—Verrières-le-Buisson, France;2. Finnish Meteorological Institute, Geophysics Department, P.O. Box 503, FIN-00101 Helsinki, Finland;1. Department of Electrical and Computer Engineering, San Diego State University, 5500 Campanile Drive, San Diego, CA 92182, USA;2. Department of Electrical and Computer Engineering, University of California San Diego, 9500 Gilman Dr., La Jolla, CA 92093, USA;3. Department of Mechanical and Aerospace Engineering, University of California San Diego, 9500 Gilman Dr., La Jolla, CA 92093, USA;4. University of Lorraine, CRAN, UMR 7039, 2 rue Jean Lamour, 54519 Vandoeuvre-les-Nancy, France;5. CNRS, CRAN, UMR 7039, France;1. Loker Hydrocarbon Research Institute and Department of Chemistry, University of Southern California, Los Angeles, CA 90089-1661, USA;2. Department of Chemistry and Biochemistry, California State University, Long Beach, 1250 Bellflower Blvd., Long Beach, CA 90840, USA;1. State Key Laboratory of Genetic Engineering and Fudan Center for Genetic Diversity and Designing Agriculture, School of Life Sciences, Fudan University, Shanghai, China;2. Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, Institute of Biodiversity Science, Fudan University, Shanghai, China;1. Department of Chemistry, Fudan University, 220 Handan Road, Shanghai 200433, China;2. Institutes of Biomedical Sciences, Fudan University, 138 Yixueyuan Road, Shanghai 200032, China |
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| Abstract: | The SWAN instrument on board SOHO is a Lyman-α photometer able to map the sky intensity with a resolution of 1°, primarily devoted to the study of the large scale distribution of solar wind from its imprints on the interplanetary sky background. In addition SWAN was extensively used to map the Lyman α emission of several comets since launch in December 1995. Here we report observations of Comet 46 P/Wirtanen near perihelion. From the recorded Lyman α intensity the H2O production rate was derived for 45 observations from 21 December 1996–17 May 1997, with a peak of 1.6±0.4×1028 mol/s just before perihelion. This should help to constrain the physical models of 46 P/Wirtanen for Rosetta mission planning purposes. |
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