Abstract
AbstractThe subsurface structures of active regions have often been inferred from helioseismic sound-speed inversions. However, pure acoustic waves are modified by magnetic fields when they propagate through solar active regions. Hence, the results of such inversions may not describe the pure sound speed. While changes in the sound speed are directly related to temperature variations, the wave speed of the modified wave does not have a simple relation with either the thermal or the magnetic structure.
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