Modelling P-Mode Interaction with a Spreading Sunspot Field
Abstract
Sunspots absorb and scatter incident p-modes. The dominant mechanism is still uncertain. One possibility, mode conversion to slow magneto-acoustic waves, has been shown to yield results in agreement with observations for the f-mode only. Absorption of p-modes in simple vertical magnetic field models is too weak by an order of magnitude or more. Here we report on numerical calculations of p-modes encountering a simple sunspot model with field which spreads with height. It is found that interesting interactions take place in the near horizontal "canopy" which may greatly enhance absorption. We present a video which aids in visualizing the interactions.
- Publication:
-
SOHO-9 Workshop on Helioseismic Diagnostics of Solar Convection and Activity
- Pub Date:
- 1999
- Bibcode:
- 1999soho....9E..47C