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Astron. Astrophys. 335, 685-690 (1998)

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Waves in structured media: non-radial solar p modes

M. Stix and Y.D. Zhugzhda

Kiepenheuer-Institut für Sonnenphysik, Schöneckstrasse 6, D-79104 Freiburg, Germany

Received 29 December 1997 / Accepted 26 March 1998

Abstract

For non-radial solar p modes we calculate corrections to the eigenfrequencies arising from the sound speed and velocity inhomogeneity of the convection zone. We use a simple periodic model, and obtain the frequency corrections by solving a Hill determinant. The frequency shifts are significant, and in most cases negative; they increase in magnitude with increasing frequency and harmonic degree l. The dependence on degree scales with the mode inertia. For large degree l this trend reverses.

For very large degree coupling occurs between the p modes and "vibrational" modes that only exist because of the horizontal structure in sound speed and velocity.

Key words: convection – Sun: granulation – Sun: oscillations

Send offprint requests to: M. Stix

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© European Southern Observatory (ESO) 1998

Online publication: June 18, 1998
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