Magnetoatmospheric Oscillations in Flux Tubes

Details Magnetoatmospheric Oscillations in Flux Tubes Magnetoatmospheric Oscillations in Flux Tubes

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998iraj...25..113b&link_type=abstract

Irish Astronomical Journal, 1998, 25(2), 113

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Scientific paper

The present investigation is a continuation of earlier work by Hasan & Christensen-Dalsgaard (1992) and Banerjee, Hasan & Christensen-Dalsgaard (1995), who have examined the effects of a weak vertical magnetic field on the normal adiabatic modes of an isothermal atmosphere by combining a semi-analytic approach, based on asymptotic dispersion relations, with numerical solutions. In the present study of the strong-field case, we concentrate on the behaviour of the modes near the avoided crossings in the k - omega diagram for zero gradient boundary conditions. It was predicted that due to strong mode coupling the eigenfrequencies in these regions become complex. We present here the consequences of mode coupling in such regions, which could be relevant for sunspots and more generally for stratified flux tubes.

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