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Mars plasma system response to solar wind disturbances during solar minimum
Univ Leicester, Dept Phys & Astron, Radio & Space Plasma Phys Grp, Leicester, Leics, England..
Univ Leicester, Dept Phys & Astron, Radio & Space Plasma Phys Grp, Leicester, Leics, England..
Univ Leicester, Dept Phys & Astron, Radio & Space Plasma Phys Grp, Leicester, Leics, England..
NASA Goddard Space Flight Ctr, Heliophys Sci Div, Greenbelt, MD USA..
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2017 (English)In: Journal of Geophysical Research - Space Physics, ISSN 2169-9380, E-ISSN 2169-9402, Vol. 122, no 6, 6611-6634 p.Article in journal (Refereed) Published
Abstract [en]

This paper is a phenomenological description of the ionospheric plasma and induced magnetospheric boundary (IMB) response to two different types of upstream solar wind events impacting Mars in March 2008, at the solar minimum. A total of 16 Mars Express orbits corresponding to five consecutive days is evaluated. Solar TErrestrial RElations Observatory-B (STEREO-B) at 1AU and Mars Express and Mars Odyssey at 1.644AU detected the arrival of a small transient interplanetary coronal mass ejection (ICME-like) on the 6 and 7 of March, respectively. This is the first time that this kind of small solar structure is reported at Mars's distance. In both cases, it was followed by a large increase in solar wind velocity that lasted for similar to 10days. This scenario is simulated with the Wang-Sheeley-Arge (WSA) - ENLIL + Cone solar solar wind model. At Mars, the ICME-like event caused a strong compression of the magnetosheath and ionosphere, and the recovery lasted for similar to 3 orbits (similar to 20h). After that, the fast stream affected the upper ionosphere and the IMB, which radial and tangential motions in regions close to the subsolar point are analyzed. Moreover, a compression in the Martian plasma system is also observed, although weaker than after the ICME-like impact, and several magnetosheath plasma blobs in the upper ionosphere are detected by Mars Express. We conclude that, during solar minimum and at aphelion, small solar wind structures can create larger perturbations than previously expected in the Martian system.

Place, publisher, year, edition, pages
2017. Vol. 122, no 6, 6611-6634 p.
Keyword [en]
ICME transient, fast solar wind stream, ionosphere of Mars, Martian plasma system, Martian boundaries, solar minimum
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-331894DOI: 10.1002/2016JA023587ISI: 000405534800049OAI: oai:DiVA.org:uu-331894DiVA: diva2:1153043
Available from: 2017-10-27 Created: 2017-10-27 Last updated: 2017-10-27Bibliographically approved

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Andrews, David J.Opgenoorth, Hermann J.
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Swedish Institute of Space Physics, Uppsala Division
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