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Evidence of Traveling Waves in Filament Threads

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Abstract

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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Authors and Affiliations

  1. Institute of Theoretical Astrophysics, University of Oslo, P.O. Box 1029, Blindern, 0315, Oslo, Norway

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

  2. Center of Mathematics for Applications, University of Oslo, P.O. Box 1053, Blindern, 0316, Oslo, Norway

    L. H. M. Rouppe van der Voort

  3. The Institute for Solar Physics, Royal Swedish Academy of Sciences, Alba Nova University Center, 106 91, Stockholm, Sweden

    M. van Noort

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  1. Y. Lin
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  2. O. Engvold
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  3. L. H. M. Rouppe van der Voort
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  4. M. van Noort
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Correspondence to Y. Lin.

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Lin, Y., Engvold, O., Rouppe van der Voort, L.H.M. et al. Evidence of Traveling Waves in Filament Threads. Sol Phys 246, 65–72 (2007). https://doi.org/10.1007/s11207-007-0402-8

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  • DOI: https://doi.org/10.1007/s11207-007-0402-8

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