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Evidence for Mixed Helicity in Erupting Filaments View all abstracts by submitter

Bernhard Kliem   Submitted: 2010-08-09 03:11

Erupting filaments are sometimes observed to undergo a rotation about the vertical direction as they rise. This rotation of the filament axis is generally interpreted as a conversion of twist into writhe in a kink-unstable magnetic flux rope. Consistent with this interpretation, the rotation is usually found to be clockwise (as viewed from above) if the post-eruption arcade has right-handed helicity, but counterclockwise if it has left-handed helicity. Here, we describe two non-active-region filament events recorded with the Extreme-Ultraviolet Imaging Telescope on the Solar and Heliospheric Observatory in which the sense of rotation appears to be opposite to that expected from the helicity of the post-event arcade. Based on these observations, we suggest that the rotation of the filament axis is, in general, determined by the net helicity of the erupting system, and that the axially aligned core of the filament can have the opposite helicity sign to the surrounding field. In most cases, the surrounding field provides the main contribution to the net helicity. In the events reported here, however, the helicity associated with the filament ''barbs'' is opposite in sign to and dominates that of the overlying arcade.

Authors: K. Muglach, Y.-M. Wang, B. Kliem
Projects: SoHO-EIT,SoHO-MDI

Publication Status: ApJ 703, 976 (2009)
Last Modified: 2010-08-09 07:49
Go to main E-Print page  Reconnection of a kinking flux rope triggering the ejection of a microwave and hard X-ray source. II. Numerical modeling  Structure and Dynamics of Quiescent Filament Channels Observed by Hinode/XRT and STEREO/EUVI  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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