Propagation of Waves in Solar Non-Isothermal Atmosphere

Details Propagation of Waves in Solar Non-Isothermal Atmosphere Propagation of Waves in Solar Non-Isothermal Atmosphere

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spd....40.1001r&link_type=abstract

American Astronomical Society, SPD meeting #40, #10.01; Bulletin of the American Astronomical Society, Vol. 41, p.822

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Scientific paper

Fundamental modes supported by a thin and isothermal magnetic flux tube embedded in the solar atmosphere are typically identified as longitudinal, transverse and torsional waves. The propagation of longitudinal and transverse tube waves is restricted to frequencies that are higher than the corresponding global cutoff frequency for each wave. No such global cutoff frequency exists for torsional tube waves, which means that the flux tube supports torsional tube waves of any frequency. The situation becomes different when a 'wide’ and isothermal flux tube is concerned; in this case, a cutoff frequency for torsional tube waves arises naturally and it becomes a local quantity. Since the solar atmosphere is not isothermal, the effects of different temperature gradients on the cutoff are investigated. A method to determine these effects is presented and applied to specific models of solar magnetic flux tubes. An interesting result is that the resulting cutoff frequency is a local quantity in the model, and that its value at a given height determines the frequency that transverse and torsional tube waves must have in order to be propagating at this height. The obtained results are applied to the VAL C model of the solar atmosphere.

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