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First ENA observations at Mars: Charge exchange ENAs produced in the magnetosheath |
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| Authors: | H Gunell K Brinkfeldt P C:son Brandt E Kallio Y Futaana H Andersson A Grigoriev RA Frahm JR Scherrer DR Linder T Säles W Schmidt J Kozyra E Roelof S Livi KC Hsieh M Grande J-A Sauvaud J-J Thocaven S Orsini M Maggi P Bochsler J Woch K Asamura |
| Institution: | a Swedish Institute of Space Physics, Box 812, SE-981 28 Kiruna, Sweden b Space Technology Ireland, National University of Ireland, Maynooth, Co. Kildare, Ireland c Applied Physics Laboratory, Johns Hopkins University, Laurel, MD 20723-6099, USA d Finnish Meteorological Institute, Box 503, FIN-00101 Helsinki, Finland e Southwest Research Institute, San Antonio, TX 7228-0510, USA f Mullard Space Science Laboratory, University College London, Surrey RH5 6NT, UK g Department of Physical Sciences, University of Helsinki, P.O. Box 64, 00014 Helsinki 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 University of Arizona, Tucson, AZ 85721, USA k Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, UK l Centre d'Etude Spatiale des Rayonnements, BP-4346, F-31028 Toulouse, France m Istituto di Fisica dello Spazio Interplanetari, I-00133 Rome, Italy n Physikalisches Institut, University of Bern, CH-3012 Bern, Switzerland o Max-Planck-Institut für Aeronomie, D-37191 Katlenburg-Lindau, Germany p Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Sagamichara, Japan q Technical University of Braunschweig, Hans-Sommer-Strasse 66, D-38106 Braunschweig, Germany |
| Abstract: | Measurements of energetic neutral atoms (ENA) generated in the magnetosheath at Mars are reported. These ENAs are the result of charge exchange collisions between solar wind protons and neutral oxygen and hydrogen in the exosphere of Mars. The peak of the observed ENA flux is  . For the case studied here, i.e., the passage of Mars Express through the martian magnetosheath around 20:15 UT on 3 May 2004, the measurements agree with an analytical model of the ENA production at the planet. It is possible to find parameter values in the model such that the observed peak in the ENA count rate during the spacecraft passage through the magnetosheath is reproduced. |
| Keywords: | Mars Solar wind Magnetospheres |
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