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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Geophys+Res+Space+Phys
2016 ; 121
(4
): 3139-3154
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Plasma observations during the Mars atmospheric "plume" event of March-April
2012
#MMPMID29552437
Andrews DJ
; Barabash S
; Edberg NJT
; Gurnett DA
; Hall BES
; Holmström M
; Lester M
; Morgan DD
; Opgenoorth HJ
; Ramstad R
; Sanchez-Cano B
; Way M
; Witasse O
J Geophys Res Space Phys
2016[Apr]; 121
(4
): 3139-3154
PMID29552437
show ga
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.