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Waves in Magnetic Flux Tubes

Published online by Cambridge University Press:  19 July 2016

B Roberts
B Roberts*
Affiliation:
Mathematical Sciences Dept, The University, St Andrews KY16 9SS, Scotland

Abstract

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The basic aspects of wave propagation in a magnetic flux tube are reviewed, with particular emphasis on the types of flux tube that occur in the solar atmosphere. Two fundamental speeds arise naturally in a description of wave propagation in a flux tube: the slow magnetoacoustic (cusp) speed cT, which is both subsonic and sub-Alfvénic, and a mean Alfvén speed ck. Both surface and body modes are supported by a tube. It is stressed that a flux tube may act as a wave guide, similar to the guidance of light by a fibre optic, or sound in an ocean layer, or seismic waves in the Earth's crust.

Type
V. Photospheric Flux Tubes
Information
Symposium - International Astronomical Union , Volume 142: Basic Plasma Processes on the Sun , 1990 , pp. 159 - 174
Copyright
Copyright © Kluwer 1990 

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