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| Paper: |
Damping of Surface Alfvén Waves in a 3D Simulation of Stellar Winds |
| Volume: |
448, 16th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun |
| Page: |
1151 |
| Authors: |
Evans, R. M.; Opher, M.; Jatenco-Pereira, V.; Gombosi, T. I. |
| Abstract: |
Surfave Alfvén wave damping has been used by many authors in order to
provide an heating and acceleration mechanism for driving winds in many
regions of HR diagram. Based on the 1D solar wind model of Jatenco-Pereíra et al. (1994) we investigate the effect of surface Alfvén wave damping, for solar minima conditions, using a three-dimensional (3D) magnetohydrodynamics (MHD) model. The surface Alfvén wave damping length LSW depends on the superradial expansion factor S of magnetic field lines. We quantify S for Carrington Rotation 1912 with a steady state solar background generated with the Space Weather Modeling Framework, and compare with estimates by Dobrzycka et al. (1999) using SOHO observations. We estimate the surface Alfvén wave damping for active regions, quiet sun, and the border between open and closed magnetic field lines (Evans et al. 2009). |
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