Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aspc..416..143m&link_type=abstract
Solar-Stellar Dynamos as Revealed by Helio- and Asteroseismology: GONG 2008/SOHO 21 ASP Conference Series, Vol. 416, proceedings
Physics
1
Scientific paper
We investigate the direct contribution of strong, sunspot-like magnetic fields to helioseismic wave travel-time shifts via two numerical forward models, a 3D ideal MHD solver and MHD ray theory. We confirm some existing ideas and bring forth new ones: (i) that the observed travel-time shifts in the vicinity of sunspots are largely governed by MHD physics, (ii) the travel-time shifts are sensitively dependent on frequency and phase speed filter parameters and the background power below the p_1 mode, and finally, (iii) despite its seeming limitations, MHD ray theory appears to succeed in capturing the essence of the travel-time variations as derived from the MHD simulations.
Cally Paul S.
Hanasoge Shravan M.
Moradi Hamed
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