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Title: The effect of the induced magnetic field on the electron density vertical profile of the Mars’ ionosphere: a Mars Express MARSIS radar data analysis and interpretation, a case study
Authors: Ramirez-Nicolas, M.
Sanchez-Cano, Beatriz
Witasse, O.
Blelly, P-L.
Vazquez, L.
Lester, M.
First Published: 2016
Citation: Planetary and Space Science (Accepted, In Press)
Abstract: We report the indirect detection of an induced magnetic field in the ionosphere of Mars and its effects in the electron density behaviour. The observations were made by the Mars Advanced Radar for Subsurface and Ionospheric Sounding (MARSIS) aboard Mars Express, in its Active Ionospheric Sounding mode. During several orbits on June 2006, the ionosphere showed an unusual behaviour, characterised by a compression of the plasma above the main ionospheric peak as observed by the topside total electron content, the plasma scale height, and the local plasma in the Mars Express surroundings. The compression was most likely due to an induced magnetic field originating from the solar wind and measured by the MARSIS antennas, which was able to penetrate into the ionosphere. In particular, for several profiles, the density distribution can be clearly defined by two different plasma scale heights, which indicates a transition region between both of them. From the balance of magnetic and thermal plasma pressures and from a comparison with a numerical model of the Martian ionosphere, the hypothesis of a penetrating induced magnetic field down to a transition altitude around 150 km is confirmed. This compressed ionosphere has also been compared with data from other orbits in the same location and at the same time period, i.e. 18.5 days of difference between first and last orbits, where there is no measured induced magnetic field, and the orbits show a clearly different behaviour.
DOI Link: 10.1016/j.pss.2016.03.017
ISSN: 0032-0633
eISSN: 1873-5088
Embargo on file until: 1-Jan-10000
Version: Post-print
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2016 Published by Elsevier Ltd. This manuscript version is made available after the end of the embargo period under the CC-BY-NC-ND 4.0 license 
Description: The file associated with this record is under a 24-month embargo from publication in accordance with the publisher's self-archiving policy. The full text may be available through the publisher links provided above.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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