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Title: Solar cycle variations in the ionosphere of Mars as seen by multiple Mars Express datasets
Authors: Sanchez-Cano, Beatriz
Lester, Mark
Witasse, O.
Milan, Stephen E.
Hall, B. E. S.
Cartacci, M.
Peter, K.
Morgan, D. D.
Blelly, P.-L.
Radicella, S.
Cicchetti, A.
Noschese, R.
Orosei, R.
Patzold, M.
First Published: 8-Mar-2016
Publisher: Wiley for American Geophysical Union
Citation: Journal of Geophysical Research: Space Physics, 2016, DOI: 10.1002/2015JA022281
Abstract: The response of the Martian ionosphere to solar activity is analyzed by taking into account variations in a range of parameters during 4 phases of the solar cycle throughout 2005-2012. Multiple Mars Express datasets have been used (such as Mars Advanced Radar for Subsurface and Ionospheric Sounding (MARSIS) in Active Ionospheric Sounding (AIS), MARSIS subsurface and MaRS radio science), which currently cover more than 10 years of solar activity. The topside of the main ionospheric layer behavior is empirically modeled through the neutral scale height parameter, which describes the density distribution in altitude, and can be used as a dynamic monitor of the solar wind-Martian plasma interaction, as well as of the medium's temperature. The main peak, the total electron content, and the relationship between the solar wind dynamic pressure and the maximum thermal pressure of the ionosphere with the solar cycle are assessed. We conclude that the neutral scale height was different in each phase of the solar cycle, having a large variation with solar zenith angle during the moderate ascending and high phases, while there is almost no variation during the moderate descending and low phases. Between end-2007 to end-2009, an almost permanent absence of secondary layer resulted because of the low level of solar X-rays. Also, the ionosphere was more likely to be found in a more continuously magnetized state. The induced magnetic field from the solar wind, even if weak, could be strong enough to penetrate more than at other solar cycle phases.
DOI Link: 10.1002/2015JA022281
ISSN: 2169-9402
Version: Published (publisher PDF)
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © the authors, 2016. This is an open-access article distributed under the terms of the Creative Commons Attribution License ( ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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