Wave propagation in a magnetic cylinder

Details Wave propagation in a magnetic cylinder Wave propagation in a magnetic cylinder

Oct 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983soph...88..179e&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 88, Oct. 1983, p. 179-191. Research supported by the Open University.

Physics

351

Coronal Loops, Magnetoacoustic Waves, Plasma Cylinders, Solar Atmosphere, Solar Oscillations, Wave Propagation, Love Waves, Photosphere, Solar Magnetic Field

Scientific paper

The nature of oscillations in a magnetic cylinder embedded in a magnetic environment is investigated. It is shown that the standard slender flux tube analysis of a kink mode in a cylinder excludes the possibility of a second mode, which arises under photospheric conditions. Under coronal conditions, two widely separated classes of oscillation can be freely sustained, one on an acoustic time-scale and the other on an Alfvenic time-scale. The acoustic-type oscillations are always present, but the much shorter period, Alfvenic-type, oscillations arise only in high density (strictly, low Alfven velocity) loops. An application to waves in fibrils is also given, and suggests (following Wentzel, 1979) that they are fast kink waves propagating in a density enhancement.

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