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3D Shape and Evolution of Two Eruptive Filaments  

Ting Li   Submitted: 2010-07-03 04:29

On 2009 Sep 26, a dramatic and large filament (LF) and a small filament (SF) eruptions were observed in the He II 304 Å ?A line by the two EUVI telescopes aboard the STEREO A and B spacecrafts. The LF heads out into space and becomes the bright core of a gradual CME, while the eruption of the SF is characterized by motions of filament materials. Using stereoscopic analysis of EUVI data, we reconstruct the 3D shape and evolution of two eruptive filaments. For the first time, we investigate the true velocities and accelerations of 12 points along the axis of the LF, and find that the velocity and acceleration vary with the measured location. The highest points among the 12 points are the fastest in the first half hour, and then the points at the low-latitude leg of the LF become the fastest. For the SF, it is an asymmetric whip-like filament eruption, and the downward material motions lead to the disappearance of the former highlatitude endpoint and the formation of a new low-latitude endpoint. Based on the temporal evolution of the two filaments, we infer that the two filaments lie in the same filament channel. By combining EUVI, COR1 and COR2 data of STEREO A together, we find that there is no impulsive or fast acceleration in this event. It displays a weak and persistent acceleration for more than 17 hours. The average velocity and acceleration of the LF are 101.8 km s-1 and 2.9 m s-2, respectively. The filament eruptions are associated with a slow CME with the average velocity of 177.4 km s-1. The velocity of the CME is nearly 1.6 times as large as that of the filament material. This event is one example of a gradual filament eruption associated with a gradual CME. In addition, the moving direction of the LF changes from a non-radial to a nearly radial direction with a variation of inclination angle of nearly 38.2◦.

Authors: Ting Li, Jun Zhang, Hui Zhao, Shuhong Yang
Projects: STEREO

Publication Status: ApJ (in press)
Last Modified: 2010-07-06 10:28
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