Multi-fluid model of comet 1P/Halley |
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| Affiliation: | 1. Observatoire de Paris-Meudon, France;2. Vikram Sarabhai Space Centre, Trivandrum, India;3. National Central University, Jhongli City, Taiwan (ROC);1. Institut für Geophysik und extraterrestrische Physik, Technische Universität Braunschweig, Mendelssohnstr. 3, 38106 Braunschweig, Germany;2. Institut für Theoretische Physik, Technische Universität Braunschweig, Mendelssohnstr. 3, 38106 Braunschweig, Germany;3. DLR-Institut für Planetenforschung, Rutherfordstr. 2, 12489 Berlin, Germany;1. NASA/Goddard SFC, Greenbelt, MD 20771, USA;2. Swedish Inst. of Space Physics, Uppsala, Sweden;3. University of Iowa, Iowa City, IA 52242, USA;1. University of Virginia, Charlottesville, VA 22904, United States;2. National Institute of Aerospace, Hampton, VA 22236, United States;3. Southwest Research Institute, San Antonio, TX 78228, United States;4. National Taiwan Normal University, Taipei, Taiwan;1. Department of Planetary Sciences, University of Arizona, 1629 E. University Blvd., Tucson, AZ 85721, United States;2. Belgian Institute for Space Aeronomy, 3 avenue Circulaire, 1180 Brussels, Belgium;3. Institut de Planétologie et d’Astrophysique de Grenoble, Université J. Fourier, Grenoble, France;4. Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80309, United States;1. Université de Bordeaux, Laboratoire d’Astrophysique de Bordeaux, UMR 5804, F-33270 Floirac, France;2. CNRS, Laboratoire d’Astrophysique de Bordeaux, UMR 5804, F-33270 Floirac, France;3. Max Planck Institute for Solar System Research, Justus-von-Liebig-Weg 3, 37077, Göttingen, Germany;4. Southwest Research Institute, San Antonio, TX 78228, United States;1. Institut für Geophysik und extraterrestrische Physik, Technische Universität Braunschweig, Mendelssohnstr. 3, 38106 Braunschweig, Germany;2. Institut für Theoretische Physik, Technische Universität Braunschweig, Mendelssohnstr. 3, 38106 Braunschweig, Germany;3. DLR-Institut für Planetenforschung, Rutherfordstr. 2, 12489 Berlin, Germany;4. Physikalisches Institut, University of Bern, Sidlerstrasse 5, 3012 Bern, Switzerland |
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| Abstract: | A new three-dimensional magnetohydrodynamic model of the coma of a comet has been developed and applied to simulations of a Halley-class coma using the solar-wind conditions of the Giotto flyby of Halley in 1986. The code developed for high-performance parallel processing computers, combines the high spatial resolution of smaller than 1 km grid spacing near the nucleus, with a large computational domain that enables structures nearly 10 million km down the comet tail to be modeled. Ions, neutrals, and electrons are considered as separate interacting fluids. Significant physical processes treated by the model include both photo and electron impact ionization of neutrals, recombination of ions, charge exchange between solar-wind ions and cometary neutrals, and frictional interactions between the three fluids considered in the model. A variety of plasma structures and physical parameters that are the output of this model are compared with relevant Giotto data from the 1986 Halley flyby. |
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