Frahm, RA;
Yamauchi, M;
Winningham, JD;
Lundin, R;
Sharber, JR;
Nilsson, H;
Coates, AJ;
(2016)
Foreshock ions observed behind the Martian bow shock.
Planetary and Space Science
, 127
pp. 15-32.
10.1016/j.pss.2015.12.011.
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Abstract
The Mars Express Analyzer of Space Plasmas and Energetic Atoms experiment contains ion and electron instruments for conducting plasma measurements. On January 23, 2012, during in-bound travel of Mars Express in the southern hemisphere of Mars from its dawn side toward periapsis at dusk, the plasma instruments measured foreshock-like ion beams extending from outside the bow shock and into the magnetosphere, continuing to a distance of about a proton gyroradius from the bow shock. These ion beams were mostly protons, were observed to have energies greater than solar wind protons, and were not gyrating, in agreement with reflections of the solar wind proton beam. Furthermore, in the foreshock region the ion energy gradually decreased toward the magnetosheath, in agreement with an acceleration by outward-directed electric field in the bowshock. The observations also suggest that this electric field exists even inside the magnetosheath within the distance of a proton gyroradius from the bow shock.
| Type: | Article |
|---|---|
| Title: | Foreshock ions observed behind the Martian bow shock |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.pss.2015.12.011 |
| Publisher version: | https://doi.org/10.1016/j.pss.2015.12.011 |
| Language: | English |
| Additional information: | This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
| Keywords: | Science & Technology, Physical Sciences, Astronomy & Astrophysics, Foreshock, Ions, Magnetosheath, Bow shock, Mars, PHOTOELECTRON ENERGY PEAKS, MARS GLOBAL SURVEYOR, SOLAR-WIND, MAGNETIC-FIELD, IMF DIRECTION, DISTRIBUTIONS, UPSTREAM, ACCELERATION, EXPRESS, MAGNETOSHEATH |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1501370 |
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