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Location of the bow shock and ion composition boundaries at Venus—initial determinations from Venus Express ASPERA-4 |
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| Authors: | C. Martinecz,M. Frä nz,N. Krupp,E. Dubinin,S. Barabash,M. Holmströ m,M. Yamauchi,Y. Futaana,H. Gunell,J.D. Winningham,J. Scherrer,D.R. Linder,E. Kallio,W. Schmidt,H.E.J. Koskinen,J. Luhmann,E.C. Roelof,C.C. Curtis,B.R. Sandel,J.-A. Sauvaud,J.-J. Thocaven,S. McKenna-Lawler,R. Cerulli-Irelli,A. Mura,P. Wurz,P. Bochsler,K. Szego,T.L. Zhang |
| Affiliation: | a MPI für Sonnensystemforschung, 37191 Katlenburg-Lindau, Germany b Institut für Theoretische Physik, TU Braunschweig, Mendelssohnstr.3, 38106 Braunschweig, Germany c Swedish Institute of Space Physics, Box 812, S-98 128, Kiruna, Sweden d Southwest Research Institute, San Antonio, TX 7228-0510, USA e Mullard Space Science Laboratory, University College London, Surrey RH5 6NT, UK f Finnish Meteorological Institute, Box 503 FIN 00101 Helsinki, Finland g University of Helsinki, Department of Physical Sciences, P.O.Box 64, FIN-00014 Helsinki, Finland h Space Physics Research Laboratory, University of Michigan, Ann Arbor, MI 48109-2143, USA i Space Science Laboratory, University of California at Berkeley, Berkeley, CA 94720-7450, USA j Institute of Geophysics and Planetary Physics, University of California, 405 Hilgard Ave, Los Angeles, CA 90095-1567, USA k Applied Physics Laboratory, Johns Hopkins University, Laurel, MD 20723-6099, USA l University of Arizona, Tucson, AZ 85721, USA m Centre d’Etude Spatiale des Rayonnements, BP-4346, F-31028 Toulouse, France n Space Technology Ireland, National University of Ireland, Maynooth, Co.Kldare, Ireland o Instituto di Fisica dello Spazio Interplanetario, I-00133 Rome, Italy p Physikalisches Institut, University of Bern, CH-3012 Bern, Switzerland q Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Sagamichara, Japan r Austrian Academy of Sciences, Space Research Institute, Schmiedlstr.6, 8042 Graz, Austria s West Virginia University, Department of Physics, Morgantown, WV 26506-6315, USA t KFKI Research Institute for Particle and Nuclear Physics, Budapest, Hungary u Institute of Mathematical and Physical Sciences, University of Wales, Aberystwyth, Ceredigion, Wales, UK |
| Abstract: | For the first time since 1992 when the Pioneer Venus Orbiter (PVO) ceased to operate, there is again a plasma instrument in orbit around Venus, namely the ASPERA-4 flown on Venus Express (inserted into an elliptical polar orbit about the planet on April 11, 2006). In this paper we report on measurements made by the ion and electron sensors of ASPERA-4 during their first five months of operation and, thereby, determine the locations of both the Venus bow shock (BS) and the ion composition boundary (ICB) under solar minimum conditions. In contrast to previous studies based on PVO data, we employ a 3-parameter fit to achieve a realistic shape for the BS. We use a different technique to fit the ICB because this latter boundary cannot be represented by a conic section. Additionally we investigate the dependence of the location of the BS on solar wind ram pressure (based on ASPERA-4 solar wind data) and solar EUV flux (using a proxy from Earth). |
| Keywords: | Venus Solar wind interaction Solar wind dynamic pressure Venus Express Bow shock Ion composition boundary |
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