Evidence of Traveling Waves in Filament Threads

Details Evidence of Traveling Waves in Filament Threads Evidence of Traveling Waves in Filament Threads

Nov 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007soph..246...65l&link_type=abstract

Solar Physics, Volume 246, Issue 1, pp.65-72

Physics

40

Scientific paper

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 Díaz 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.

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