Paper:	Signatures of Emerging Subsurface Structures in Acoustic Power Maps
Volume:	416, Solar-Stellar Dynamos as Revealed by Helio- and Asteroseismology: GONG 2008/SOHO 21
Page:	147
Authors:	Hartlep, T.; Kosovichev, A. G.; Zhao, J.; Mansour, N. N.
Abstract:	We show that under suitable conditions subsurface structures can alter the average acoustic power observed at the photosphere. By using numerical simulations of wave propagation, we investigate whether this effect can be used to detect emerging active regions before they appear on the surface. In the simulations, subsurface structures are modeled as regions with enhanced or reduced acoustic wave speed. We show how the acoustic power above a subsurface region depends on the sign, depth and strength of the wave speed perturbation. For comparison, we analyze observations from SOHO/MDI of the emergence of active region NOAA 10488.

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