Propagation speeds and acoustic damping of waves in magnetic flux tubes

Details Propagation speeds and acoustic damping of waves in magnetic flux tubes Propagation speeds and acoustic damping of waves in magnetic flux tubes

Jan 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982soph...75....3s&link_type=abstract

Solar Physics, vol. 75, Jan. 1982, p. 3-17.

Physics

170

Acoustic Attenuation, Magnetic Flux, Magnetoacoustics, Plasma Waves, Propagation Velocity, Solar Physics, Convective Flow, Coronal Loops, Solar Corona, Transverse Waves

Scientific paper

Wave mode propagation speeds are derived for the case of a thin magnetic tube in an either magnetized or unmagnetized fluid that is otherwise homogeneous. Three wave types are found, including a torsional Alfven wave and two others which are specific for the thin tube and are named longitudinal and transversal according to their polarization properties. It is found that these tube waves may be damped by radiating an MHD or acoustic wave into the surroundings of the tube. The conditions for the occurrence of this acoustic damping and its rates are derived, and the behavior of the waves in the solar convection zone and corona is discussed. In the coronal loops, the longitudinal wave is not damped by MHD radiation, and the transversal wave is damped if the loop is less dense than the surroundings but not if it is denser.

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