Propagation of axisymmetric disturbances on a twisted magnetic flux tube

Details Propagation of axisymmetric disturbances on a twisted magnetic flux tube Propagation of axisymmetric disturbances on a twisted magnetic flux tube

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...282..769b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 282, July 15, 1984, p. 769-775.

Astronomy and Astrophysics

Astrophysics

9

Magnetic Field Configurations, Magnetohydrodynamic Waves, Solar Magnetic Field, Magnetohydrodynamic Stability, Wave Propagation

Scientific paper

The propagation of axisymmetric disturbances on a twisted magnetic flux tube in an inviscid, incompressible, unstratified atmosphere of infinite electrical conductivity is considered. Dispersion effects due to twist appear quickly only on highly twisted flux tubes for a superposition of the lowest radial eigenmodes and wavelengths comparable to the flux tube radius. These radial profiles become distorted and show focusing effects after propagating on the order of ten flux tube radii. This suggests twist effects on hydromagnetic wave propagation may be important where the flux tubes come up through the surface and expand into the tenuous atmosphere.

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