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Comparison of subsurface sound-speed structures of three active regions

  • S. Couvidat (a1), A. C. Birch (a1), S. P. Rajaguru (a1) and A. G. Kosovichev (a1)

Abstract

We analyze three solar active regions observed with the MDI instrument onboard SoHO (Scherrer et al. 1995). We apply the time-distance helioseismology formalism to derive the travel times of acoustic waves propagating through these active regions. The inversion of these acoustic travel times gives us access to the 3D sound-speed structure below the sunspots. We compare the main characteristics of these inversion results as a function of the active region size and magnetic field strength.

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Comparison of subsurface sound-speed structures of three active regions

  • S. Couvidat (a1), A. C. Birch (a1), S. P. Rajaguru (a1) and A. G. Kosovichev (a1)

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