Conditions for Propagation of Torsional Waves in Solar Magnetic Flux Tubes

Details Conditions for Propagation of Torsional Waves in Solar Magnetic Flux Tubes Conditions for Propagation of Torsional Waves in Solar Magnetic Flux Tubes

Nov 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007soph..246..133r&link_type=abstract

Solar Physics, Volume 246, Issue 1, pp.133-143

Physics

4

Solar Atmosphere, Mhd, Wave Motions

Scientific paper

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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