Magnetoseismology: Eigenmodes of torsional Alfven waves in stratified solar waveguides

Verth, Gary, Erdélyi, Robert and Goossens, Marcel (2010) Magnetoseismology: Eigenmodes of torsional Alfven waves in stratified solar waveguides. The Astrophysical Journal, 714 (2). pp. 1637-1648. ISSN 0004-637X

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There have recently been significant claims of Alfvén wave observation in the solar chromosphere and corona. We investigate how the radial and longitudinal plasma structuring affects the observational properties of torsional Alfvén waves in magnetic flux tubes for the purposes of solar magnetoseismology. The governing magnetohydrodynamic equations of these waves in axisymmetric flux tubes of arbitrary radial and axial plasma structuring are derived and we study their observable properties for various equilibria in both thin and finite-width magnetic flux tubes. For thin flux tubes, it is demonstrated that observation of the eigenmodes of torsional Alfvén waves can provide temperature diagnostics of both the internal and surrounding plasma. In the finite-width flux tube regime, it is shown that these waves are the ideal magnetoseismological tool for probing radial plasma inhomogeneity in solar waveguides.

Item Type: Article
Uncontrolled Keywords: magnetic fields, magnetohydrodynamics (MHD), sun: atmosphere, sun: oscillations
Subjects: F300 Physics
G900 Others in Mathematical and Computing Sciences
Department: Faculties > Engineering and Environment > Mathematics, Physics and Electrical Engineering
Depositing User: EPrint Services
Date Deposited: 26 Apr 2011 11:37
Last Modified: 13 Oct 2019 00:30

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