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Evidence of Traveling Waves in Filament Threads View all abstracts by submitter

Yong Lin   Submitted: 2007-06-07 03:00

High-resolution Hα filtergrams (0.2″) obtained with the Swedish 1-m Solar Telescope resolve numerous very thin, thread-like structures in solar filaments. The threads are believed to represent thin magnetic flux tubes that must be longer than the observable threads. We report on evidence for small-amplitude (1 ? 2 km s-1) waves propagating along a number of threads with an average phase velocity of 12 km s-1 and a wavelength of 4″. The oscillatory period of individual threads vary from 3 to 9 minutes. Temporal variation of the Doppler velocities averaged over a small area containing a number of individual threads shows a short-period (3.6 minutes) wave pattern. These short-period oscillations could possibly represent fast modes in accordance with numerical fibril models proposed by D?az et al. (Astron. Astrophys. 379, 1083, 2001). In some cases, it is clear that the propagating waves are moving in the same direction as the mass flows.

Authors: Y. Lin, O. Engvold, L.H.M. Rouppe van der Voort, M. van Noort

Publication Status: Solar Physics (in press)
Last Modified: 2007-08-01 05:45
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