The Surface Amplitudes and Frequencies of p-Mode Oscillations in Active Regions
Abstract
It is well established that the surface amplitudes of solar p-mode oscillations are reduced in regions of magnetic activity. In this paper, we examine the conjecture that this reduction is produced by direct modification of the surface values of the p-mode eigenfunctions, rather than changes in the mode energies or alterations in the spectral line formation process. We calculate the oscillation modes of a solar model with a horizontal magnetic field, convection, and radiative diffusion. We find that magnetic fields with strengths characteristic of solar active regions can produce the observed decrease of surface power.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- February 1997
- DOI:
- 10.1086/303615
- Bibcode:
- 1997ApJ...476..392H
- Keywords:
-
- Sun: Activity;
- Sun: Magnetic Fields;
- Sun: Oscillations