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Evidence from EIS for axial filament rotation before a large flare View all abstracts by submitter

David Williams   Submitted: 2009-02-04 00:02

In this article, we present observations made with the Extreme-ultraviolet Imaging Spectrometer (EIS) on-board the Hinode solar satellite, of an active region filament in the He II emission line at 256.32 ?. The host active region (AR 10930) produces an X-class flare during these observations. We measure Doppler shifts with apparent velocities of up to 20 km s-1, which are antisymmetric about the filament length and occur several minutes before the flare?s impulsive phase. This is indicative of a rotation of the filament, which is in turn consistent with expansion of a twisted flux rope due to the MHD helical kink instability. This is the first time that such an observation has been possible in this transition-region line, and we note that the signature observed occurs before the first indications of pre-flare activity in the GOES solar soft X-ray flux, suggesting that the filament begins to destabilise in tandem with a reorganistation of the local magnetic field. We suggest that this expansion is triggered by the decrease of magnetic tension around, and/or total pressure above, the filament.

Authors: Williams, D. R., Harra, L. K., Brooks, D. H., Imada, S., Hansteen, V. H.
Projects: Hinode/EIS

Publication Status: Accepted for publication in PASJ (Vol. 61, No. 3, June 2009)
Last Modified: 2009-02-04 08:44
Go to main E-Print page  A Critical Assessment of Nonlinear Force-Free Field Modeling of the Solar Corona for Active Region 10953  Damping of filament thread oscillations: effect of the slow continuum  Edit Entry  Download Preprint  Submitter's Homepage Delete Entry 

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