A MULTI-SPACECRAFT VIEW OF A GIANT FILAMENT ERUPTION DURING 26/27 SEPTEMBER 2009 |
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Sanjay Gusain Submitted: 2012-10-24 15:01
27 September 2009. The filament eruption was associated with a relatively slow coronal mass ejection
(CME). The filament consisted of a large and a small part, both parts erupted nearly
simultane-
ously. Here we focus on the eruption associated with the larger part of the filament. The STEREO
satellites were separated by about 117◦ during this event, so we additionally used SoHO/EIT and
CORONAS/TESIS observations as a third eye (Earth view) to aid our measurements. We measure
the plane-of-sky tra jectory of the filament as seen from STEREO-A and TESIS view-points. Us-
ing a simple trigonometric relation, we then use these measurements to estimate the true direction
of propagation of the filament which allows us to derive the true R/R⊙-time profile of the filament
apex. Furthermore, we develop a new tomographic method that can potentially provide a more robust
three-dimensional reconstruction by exploiting multiple simultaneous views. We apply this method
also to investigate the 3D evolution of the top part of filament. We expect this method to be
useful when SDO and STEREO observations are combined. We then analyze the kinematics of the
eruptive filament during its rapid acceleration phase by fitting different functional forms to the
height-time data derived from the two methods. We find that, for both methods, an exponential
function fits the rise profile of the filament slightly better than parabolic or cubic functions.
Finally, we confront these
results with the predictions of theoretical eruption models.
Authors: Sanjay Gosain, Brigitte Schmieder, Guy Artzner, Sergei Bogachev, and Tibor Torok
Projects: CORONAS-F,SoHO-EIT,SoHO-MDI,STEREO
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Publication Status: Accepted in ApJ
Last Modified: 2012-10-26 15:38
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