Conditions for Propagation of Torsional Waves in Solar Magnetic Flux Tubes |
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Authors: | S Routh Z E Musielak R Hammer |
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Institution: | 1.Department of Physics,University of Texas at Arlington,Arlington,USA;2.Kiepenheuer-Institut für Sonnenphysik,Freiburg,Germany |
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Abstract: | Propagation of torsional waves along isothermal and initially-untwisted magnetic-flux tubes embedded in the solar atmosphere
is studied analytically. Conditions for wave propagation along thin and wide magnetic-flux tubes are determined, and it is
shown that the propagation along thin tubes is cutoff free; however, for wide tubes the propagation is affected by a cutoff
frequency. A method to determine the cutoff frequency is presented and applied to a specific model of solar magnetic flux
tubes. An interesting result is that the cutoff frequency is a local quantity in the model and that its value at a given height
determines the frequency that torsional tube waves must have to propagate at this height. |
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Keywords: | Solar atmosphere MHD Wave motions |
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