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Title: Wave propagation in stratified plasmas
Author: Hargreaves, James
ISNI:       0000 0001 3531 7970
Awarding Body: University of Sheffield
Current Institution: University of Sheffield
Date of Award: 2008
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In this Thesis the theoretical aspects of MHD wave propagation in stratified magnetic flux tubes are studied. In particular the focus is directed firstly to the study of wave propagation in flux tubes with the presence of a background flow and secondly to wave propagation in non-ideal, i.e. viscous, media. Recent observational evidence from the Hinode satellite shows clearly that plasma flows are ubiquitous in the solar atmosphere. Longitudinal and transverse tube waves in flux tubes with a background flow are studied, with the governing equations being derived and solved for a number of footpoint drivers. Applications to the Sun are made and some interesting and important effects on wave propagation are found. The solar atmosphere is widely recognised as a dissipative medium, although most previous studies of wave propagation in stratified atmospheres have assumed an ideal medium. In the second half of the Thesis the effect of viscosity on wave propagation is investigated for both longitudinal and transverse tube waves in a stratified flux tube. The governing equations are derived and solved for both temporal and spatial boundary conditions.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available