Damping of Fast Magnetohydrodynamic Oscillations in Quiescent Filament Threads

Arregui, I.; Terradas, J.; Oliver, R.; Ballester, J. L.
Bibliographical reference

The Second Hinode Science Meeting: Beyond Discovery-Toward Understanding ASP Conference Series, Vol. 415, proceedings of a meeting held 29 September through 3 October 2008 at the National Center for Atmospheric Research, Boulder, Colorado, USA. Edited by B. Lites, M. Cheung, T. Magara, J. Mariska, and K. Reeves. San Francisco: Astronomical Society of the Pacific, 2009, p.71

Advertised on:
12
2009
Number of authors
4
IAC number of authors
0
Citations
0
Refereed citations
0
Description
High-resolution observations provide evidence of the existence of small-amplitude transverse oscillations in solar filament fine structures. These oscillations are believed to represent fast magnetohydrodynamic (MHD) waves and the disturbances are seen to be damped in short timescales of the order of 1 to 4 periods. We propose that, due to the highly inhomogeneous nature of the filament plasma at the fine-structure spatial scale, the phenomenon of resonant absorption is likely to operate in the temporal attenuation of fast MHD oscillations. By considering transverse inhomogeneity in a straight flux tube model we find that, for density inhomogeneities typical of filament threads, the decay times are of a few oscillatory periods only.