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Plasma intrusion above Mars crustal fields—Mars Express ASPERA-3 observations |
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| Authors: | M. Frä nz,J.D. Winningham,E. Roussos,S. Barabash,M. Holmströ m,M. Yamauchi,R.A. Frahm,J.R. Scherrer,Y. Soobiah,D.O. Kataria,T. Sä les,W. Schmidt,J. Kozyra,E. Roelof,S. Livi,K.C. Hsieh,M. Grande,J.-A. Sauvaud,J.-J. Thocaven,S. Orsini,M. Maggi,P. Bochsler,K. Asamura |
| Affiliation: | a MPI für Sonnensystemforschung, Max-Planck-Str. 2, 37191 Katlenburg-Lindau, Germany b Southwest Research Institute, San Antonio, TX 7228-0510, USA c Swedish Institute of Space Physics, Box 812, S-98 128, Kiruna, Sweden d Mullard Space Science Laboratory, University College London, Surrey RH5 6NT, UK e Finnish Meteorological Institute, Box 503, FIN-00101 Helsinki, Finland f Department of Physical Sciences, University of Helsinki, P.O. Box 64, 00014 Helsinki, Finland g Space Physics Research Laboratory, University of Michigan, Ann Arbor, MI 48109-2143, USA h Space Science Laboratory, University of California in Berkeley, Berkeley, CA 94720-7450, USA i Applied Physics Laboratory, Johns Hopkins University, Laurel, MD 20723-6099, 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 Space Technology Ireland, National University of Ireland, Maynooth, Co. Kildare, Ireland n Istituto di Fisica dello Spazio Interplanetari, I-00133 Rome, Italy o Physikalisches Institut, University of Bern, CH-3012 Bern, Switzerland 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: | Using data of the ASPERA-3 instrument on board the European Mars Express spacecraft we investigate the effect of the martian crustal fields on electrons intruding from the magnetosheath. For the crustal field strength we use published data obtained by the Mars Global Surveyor MAG/ER instrument for a fixed altitude of 400 km. We use statistics on 13 months of 80-100 eV electron observations to show that the electron intrusion altitude determined by a probability measure is approximately linearly dependent on the total field strength at 400 km altitude. We show that on the dayside the mean electron intrusion altitude describes the location of the Magnetic Pile-Up Boundary (MPB) such that we can quantify the effect of the crustal fields on the MPB. On the nightside we quantify the shielding of precipitating electrons by the crustal fields. |
| Keywords: | 96.30.Gc 94.05.-a 96.12.Jt |
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