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Measurements of Acoustic Waves Scattered by Sunspots

Measurements of Acoustic Waves Scattered by Sunspots. Dean-Yi Chou. Collaborators:. Tsing Hua University, Taiwan. Hui Zhao Ming-Hsu Yang. (Stanford, April 2011, LoHCo Workshop). Waves Scattered by a Sunspot. Cameron et al. 2008. The incident wave is a plane wave packet.

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Measurements of Acoustic Waves Scattered by Sunspots

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  1. Measurements of Acoustic Waves Scattered by Sunspots Dean-Yi Chou Collaborators: Tsing Hua University, Taiwan Hui Zhao Ming-Hsu Yang (Stanford, April 2011, LoHCo Workshop)

  2. Waves Scattered by a Sunspot

  3. Cameron et al. 2008 The incident wave is a plane wave packet. Cross-correlation between the reference line and each point

  4. Data NOAA 11092 HMI: 30 July – 5 August 2010 (13,583 frames)

  5. The cross-correlation function relates to the wave function, but is not the wave function!!!

  6. Comparison of CCF and Wave • Initially, the wave is narrower than the CCF. • As it propagates, the width of wave increases faster than the width of CCF • because of dispersion.

  7. Interference Patterns from total waves

  8. A Phenomenological Model wave equation in QS σ describes magnetic regions wave equation with magnetic fields solution Green’s function If

  9. Scattered Waves from a Model constant σ inside the circular area

  10. The End

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