Fast Magnetohydrodynamic Oscillations in a Fibril Prominence Model
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Observations of quiescent filaments show fine-scale structures, suggesting that they can be composed of small-scale threads or fibrils. Here, we study the oscillations of group of periodic fibrils in a Cartesian geometry using Bloch's theorem. The periodic array of fibrils provides a bridge between the seemingly different oscillations of a finite number of fibrils and the oscillations of an homogeneous prominence. Our results show that fine structure plays an important role and cannot be neglected. The filling factor can be used to obtain reliable estimates of periods. Also, the presence of the fibrils introduces a fine-scale modulation in the spatial structure of the global oscillations.
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- Ashcroft, N.W. and Mermin, N.D.: 1976, Solid State Physics, Saunders College Publishing, Philadelphia, p. 133.Google Scholar
- Díaz, A.J.: 2004, Ph.D. Thesis, Universitat de les Illes Balears, Spain.Google Scholar
- Engvold, O.: 2001, in: J.L. Ballester and B. Roberts (eds.), INTAS Workshop on MHD Waves in Astrophysical Plasmas, Universitat de les Illes Balears, Spain.Google Scholar
- Engvold, O.: 2004, in: A.V. Stephanov, E.E. Benevolenskaya, and A.G. Kosovichev (eds.), Proceedings of the IAU Colloquium on Multiwavelength Investigations of Solar Activity, Cambridge University Press, Cambridge, p. 187.Google Scholar
- Engvold, O., Kjeldseth-Moe, O., Bartoe, J.D.F., and Brueckner, G.: 1987, in: A.V. Stephanov (ed.), Proceedings of the 21st ESLAB Symposium, ESA SP-275, Noordwijk, Netherlands, p. 21.Google Scholar
- Lin, Y.: 2004, Ph.D. Thesis, University of Oslo, Oslo.Google Scholar
- Schmieder, B. and Mein, P.: 1989, Hvar. Obs. Bull. 13, IAU Colloq. 119, 31.Google Scholar