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Plasma observations during the Mars atmospheric "plume" event of March-April 2012

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journal contribution
posted on 12.04.2016, 08:42 by D. J. Andrews, S. Barabash, N. J. T. Edberg, D. A. Gurnett, B. E. S. Hall, M. Holmstrom, M. Lester, G. D. Morgan, H. J. Opgenoorth, R. Ramstad, Beatriz Sanchez-Cano, M. Way, O. Witasse
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.

History

Citation

Journal of Geophysical Research: Space Physics, 2016 121, 3139–3154

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy

Version

VoR (Version of Record)

Published in

Journal of Geophysical Research: Space Physics

Publisher

Wiley, American Geophysical Union (AGU)

issn

2169-9402

Acceptance date

21/03/2016

Copyright date

2016

Available date

03/03/2017

Publisher version

http://onlinelibrary.wiley.com/doi/10.1002/2015JA022023/abstract

Language

en

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