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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Routh, S., Musielak, Z.E. & Hammer, R. Conditions for Propagation of Torsional Waves in Solar Magnetic Flux Tubes. Sol Phys 246, 133–143 (2007). https://doi.org/10.1007/s11207-007-0400-x
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DOI: https://doi.org/10.1007/s11207-007-0400-x