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Empirical model of the Martian dayside ionosphere: Effects of crustal magnetic fields and solar ionizing flux at higher altitudes
Charles Univ Prague, Fac Math & Phys, Prague, Czech Republic..
Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA..
Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
2016 (English)In: Journal of Geophysical Research - Space Physics, ISSN 2169-9380, E-ISSN 2169-9402, Vol. 121, no 2, 1760-1771 p.Article in journal (Refereed) PublishedText
Abstract [en]

We use electron density profiles measured by the Mars Advanced Radar for Subsurface and Ionosphere Sounding instrument on board the Mars Express spacecraft to investigate the effects of possible controlling parameters unconsidered in the empirical model of Nemec et al. (2011, hereafter N11). Specifically, we focus on the effects of crustal magnetic fields and F-10.7 proxy of the solar ionizing flux at higher altitudes. It is shown that while peak electron densities are nearly unaffected by crustal magnetic fields, electron densities at higher altitudes are significantly increased in areas of stronger magnetic fields. The magnetic field inclination appears to have only a marginal effect. Moreover, while the N11 empirical model accounted for the variable solar ionizing flux at low altitudes, the high-altitude diffusive region was parameterized only by the solar zenith angle and the altitude. It is shown that this can lead to considerable inaccuracies. A simple correction of the N11 model, which takes into account both the crustal magnetic field magnitude and the effect of F-10.7 at higher altitudes, is suggested.

Place, publisher, year, edition, pages
2016. Vol. 121, no 2, 1760-1771 p.
Keyword [en]
Mars, MARSIS, ionosphere
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-294595DOI: 10.1002/2015JA022060ISI: 000373002100061OAI: oai:DiVA.org:uu-294595DiVA: diva2:931007
Available from: 2016-05-26 Created: 2016-05-25 Last updated: 2016-05-26Bibliographically approved

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Andrews, David J.
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Swedish Institute of Space Physics, Uppsala Division
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Journal of Geophysical Research - Space Physics
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