Deep-Focus Diagnostics of Sunspot Structure [chapter]

H. Moradi, S. M. Hanasoge
2009 Astrophysics and Space Science Proceedings  
In sequel to Moradi et al. [2009, ApJ, 690, L72], we employ two established numerical forward models (a 3D ideal MHD solver and MHD ray theory) in conjunction with time-distance helioseismology to probe the lateral extent of wave-speed perturbations produced in regions of strong, near-surface magnetic fields. We continue our comparisons of forward modeling approaches by extending our previous surface-focused travel-time measurements with a common midpoint deep-focusing scheme that avoids the
more » ... of oscillation signals within the sunspot region. The idea is to also test MHD ray theory for possible application in future inverse methods.
doi:10.1007/978-3-642-02859-5_35 fatcat:yclgutr5bfgizjdql33de3mnla