Hargreaves, James (2008) Wave Propagation in Stratified Plasmas. PhD thesis, University of Sheffield.
Abstract
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.
Metadata
Awarding institution: | University of Sheffield |
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Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > School of Mathematics and Statistics (Sheffield) |
Identification Number/EthosID: | uk.bl.ethos.489650 |
Depositing User: | EThOS Import Sheffield |
Date Deposited: | 30 Sep 2019 10:16 |
Last Modified: | 30 Sep 2019 10:16 |
Open Archives Initiative ID (OAI ID): | oai:etheses.whiterose.ac.uk:24979 |
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