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Observations of magnetic anomaly signatures in Mars Express ASPERA-3 ELS data |
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| Authors: | Y Soobiah AJ Coates DO Kataria RA Frahm JR Scherrer R Lundin H Andersson A Grigoriev H Koskinen T Säles W Schmidt J Luhmann D Williams CC Curtis BR Sandel M Carter A Fedorov S McKenna-Lawler R Cerulli-Irelli P Wurz N Krupp M Fränz C Dierker |
| Institution: | a Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey RH5 6NT, UK b Southwest Research Institute, San Antonio, TX 7228-0510, USA c Swedish Institute of Space Physics, Box 812, S-98 128 Kiruna, Sweden d Finnish Meteorological Institute, Box 503, FIN-00101 Helsinki, Finland e Department of Physical Sciences, University of Helsinki, Box 64, FIN-00014 Helsinki, Finland f Space Physics Research Laboratory, University of Michigan, Ann Arbor, MI 48109-2143, USA g Space Science Laboratory, University of California in Berkeley, Berkeley, CA 94720-7450, USA h Applied Physics Laboratory, Johns Hopkins University, Laurel, MD 20723-6099, USA i University of Arizona, Tucson, AZ 85721, USA j Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 0QX, UK k Centre d'Etude Spatiale des Rayonnements, BP-4346, F-31028 Toulouse, France l Space Technology Ireland, National University of Ireland, Maynooth, Co. Kildare, Ireland m Istituto di Fisica dello Spazio Interplanetari, I-00133 Rome, Italy n University of Bern, Physikalisches Institut, 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: | Mars Express (MEX) Analyser of Space Plasmas and Energetic Atoms (ASPERA-3) data is providing insights into atmospheric loss on Mars via the solar wind interaction. This process is influenced by both the interplanetary magnetic field (IMF) in the solar wind and by the magnetic ‘anomaly’ regions of the martian crust. We analyse observations from the ASPERA-3 Electron Spectrometer near to such crustal anomalies. We find that the electrons near remanent magnetic fields either increase in flux to form intensified signatures or significantly reduce in flux to form plasma voids. We suggest that cusps intervening neighbouring magnetic anomalies may provide a location for enhanced escape of planetary plasma. Initial statistical analysis shows that intensified signatures are mainly a dayside phenomenon whereas voids are a feature of the night hemisphere. |
| Keywords: | Magnetic fields Solar wind Mars |
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