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Title: Plasma observations during the Mars atmospheric "plume" event of March-April 2012
Authors: Andrews, D. J.
Barabash, S.
Edberg, N. J. T.
Gurnett, D. A.
Hall, B. E. S.
Holmstrom, M.
Lester, M.
Morgan, G. D.
Opgenoorth, H. J.
Ramstad, R.
Sanchez-Cano, Beatriz
Way, M.
Witasse, O.
First Published: 2016
Publisher: Wiley, American Geophysical Union (AGU)
Citation: Journal of Geophysical Research: Space Physics, 2016 (Accepted, In press)
Abstract: We present initial analysis and conclusions from plasma observations made during the reported “Mars plume event” of March - April 2012. During this period, multiple independent amateur observers detected a localized, high-altitude “plume” over the Martian dawn terminator [Sanchez-Lavega et al., Nature, 2015, doi:10.1038/nature14162], the cause of which remains to be explained. The estimated brightness of the plume exceeds that expected for auroral emissions, and its projected altitude greatly exceeds that at which clouds are expected to form. We report on in-situ measurements of ionospheric plasma density and solar wind parameters throughout this interval made by Mars Express, obtained over the same surface region, but at the opposing terminator. Measurements in the ionosphere at the corresponding location frequently show a disturbed structure, though this is not atypical for such regions with intense crustal magnetic fields. We tentatively conclude that the formation and/or transport of this plume to the altitudes where it was observed could be due in part to the result of a large interplanetary coronal mass ejection (ICME) encountering the Martian system. Interestingly, we note that the only similar plume detection in May 1997 may also have been associated with a large ICME impact at Mars.
DOI Link: 10.1002/2015JA022023
ISSN: 2169-9402
Embargo on file until: 1-Jan-10000
Version: Post-print
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2016. American Geophysical Union. All Rights Reserved. The file associated with this record is under a permanent embargo while publication is In Press in accordance with the publisher's institutional 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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