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Waves in structured media: non-radial solar p modes
M. Stix and
Received 29 December 1997 / Accepted 26 March 1998
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
Online publication: June 18, 1998