Amplitude Suppression and Absorption of p-Modes by a Magnetic Flux Tube

Details Amplitude Suppression and Absorption of p-Modes by a Magnetic Flux Tube Amplitude Suppression and Absorption of p-Modes by a Magnetic Flux Tube

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...681..664g&link_type=abstract

The Astrophysical Journal, Volume 681, Issue 1, pp. 664-671.

Astronomy and Astrophysics

Astronomy

7

Sun: Helioseismology, Sun: Magnetic Fields, Sun: Sunspots

Scientific paper

The interaction of p-modes (acoustic waves) with a magnetic flux tube is investigated. A set of linearized MHD equations is solved numerically in a two-dimensional domain with cylindrical geometry. The wave functions for p-modes are calculated in and around magnetic flux tubes using eigenfunctions from the unperturbed solution as a boundary condition. The amplitudes of the oscillations are found to be suppressed in the magnetized region with the suppression decreasing with depth. It is also found that the absorption of p-modes strongly depends on the degree l as well as the flux tube radius and the magnetic field strength. Convergence of magnetic field may be necessary in order to fit simultaneously the observed phase shifts and absorption coefficients.

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