SH53B-2488
Dissipationless Damping of Compressive MHD Modes in Twisted Flux Tubes

Friday, 18 December 2015
Poster Hall (Moscone South)
Ioannis Giagkiozis, University of Sheffield, Sheffield, United Kingdom, Viktor Fedun, University of Sheffield, Sheffield, S10, United Kingdom, Gary Verth, University of Sheffield, School of Mathematics and Statistics, Sheffield, United Kingdom, Marcel L. Goossens, University of Leuven, Leuven, Belgium and Tom Van Doorsselaere, KULeuven, Leuven, Belgium
Abstract:
Axisymmetric modes in straight magentic flux tubes exhibit a cutoff in the long wavelength limit and no damping is predicted. However, as soon as weak magnetic twist is introduced inside as well as outside the magnetic flux tube the cutoff recedes. Furthermore, when density variations are also incomporated within the model
resonant absorption appears. In this work we explore analytically the expected damping times for waves within the Alfven continuum for different solar atmospheric conditions. Based on the results in this work we offer insight on recent observations of sausage wave damping in the chromosphere.
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