Wave propagation in intense flux tubes

Details Wave propagation in intense flux tubes Wave propagation in intense flux tubes

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983soph...87...77r&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 87, Aug. 1983, p. 77-93.

Physics

37

Magnetic Flux, Photosphere, Solar Atmosphere, Wave Propagation, Acoustic Propagation, Gravity Waves, Longitudinal Waves, Nonadiabatic Conditions, Propagation Velocity

Scientific paper

The nature of nonadiabatic wave propagation in a slender magnetic flux tube is explored. The results of the theory are compared with the observations of Giovanelli et al. (1978), and found to be in general agreement. Those observations, of tubes in the photosphere-chromosphere, show outwardly propagating waves, with periods of 300 s, which take some 19 s to propagate from one level of line formation to another level higher in the atmosphere. In sharp contrast to this, is the time of 7 s for a similar disturbance outside the tube to propagate between the same two levels of line formation, estimated to be some 600 km apart in the field-free atmosphere. It is argued that the sharply contrasting propagation times for the tube and its environment is principally due to the elasticity of the tube and its subsequent propensity for propagation. A nonadiabatic disturbance may be essentially propagating within the tube but essentially nonpropagating outside, with considerably slower phase speeds thus arising inside the tube. The theory suggests that the observed disturbances are nonadiabatic, acoustic-gravity waves channelled along a magnetic flux tube and modulated by external pressure variations.

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