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| Paper: |
The Wavefunctions of Solar Acoustic Waves Scattered by Sunspots |
| Volume: |
479, Progress in Physics of the Sun and Stars |
| Page: |
419 |
| Authors: |
Chou, D.-Y.; Zhao, H. |
| Abstract: |
Solar acoustic waves are scattered by sunspots because of an interaction between them. The interaction can be viewed as the sunspot, excited by the incident wave, generates the scattered wave, and the scattered wave is added to the incident wave to form the total wave around the sunspot. We use a deconvolution scheme to obtain the wavefunction of the wave on the solar surface at various times from cross-correlation functions computed between the incident wave and the signals at other points on the surface. The wavefunction of the scattered wave is obtained by subtracting the wavefunction of the incident wave from that of the total wave. We use the incident waves of radial order n = 0–5 to measure the scattered waves from n to n' for Active Region NOAA 11084. The scattered wave is detected up to n – n' = ±2. For n' = n, the ratio of scattered wave amplitude to incident wave amplitude decreases with n; but for n' ≠ n, the ratio of scattered wave amplitude to incident wave amplitude increases with n. The ultimate goal is to measure the scattered waves from a mode (n, kx, ky) to another mode (n', k'x, k'y), namely the elements of the scattering matrix, which provide the most complete information on the interaction of waves with sunspots. |
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