Shear Alfvén modes in magnetized spherical shells

Details Shear Alfvén modes in magnetized spherical shells Shear Alfvén modes in magnetized spherical shells

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sf2a.conf..267r&link_type=abstract

SF2A-2004: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 14-18, 2004. Edited by F. Combes, D. Barret

Astronomy and Astrophysics

Astrophysics

Scientific paper

An investigation of shear Alfvén waves inside a spherical shell is carried out, in which the background magnetic field is dipolar and resistive effects are taken into account. Numerical results indicate two basic behaviours for both the axisymmetric and non-axisymmetric cases. Poloidal modes appear to remain regular, except for internal shear layers, when kinetic and magnetic diffusivities become arbitrarily small, whereas toroidal modes become singular. Analytical results are provided for the axisymmetric toroidal case. The corresponding eigenvalues also exhibit different behaviours in the two cases.

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