caa a22 4500 445345713 CHVBK 20180317142828.0 cr unu---uuuuu 170323e20110201xx s 000 0 eng 10.1007/s11207-010-9544-1 doi (NATIONALLICENCE)springer-10.1007/s11207-010-9544-1 Signatures of Emerging Subsurface Structures inAcoustic Power Maps of the Sun [Elektronische Daten] [T. Hartlep, A. Kosovichev, J. Zhao, N. Mansour] We show that under certain conditions, subsurface structures in the solar interior can alter the average acoustic power observed at the photosphere above them. By using numerical simulations of wave propagation, we show that this effect is large enough for it to be potentially used for detecting emerging active regions before they appear on the surface. In our simulations, simplified subsurface structures are modeled as regions with enhanced or reduced acoustic wave speed. We investigate the dependence of the acoustic power above a subsurface region on the sign, depth, and strength of the wave-speed perturbation. Observations from the Solar and Heliospheric Observatory/Michelson Doppler Imager (SOHO/MDI) prior and during the emergence of NOAA active region 10488 are used to test the use of acoustic power as a potential precursor of the emergence of magnetic flux. Springer Science+Business Media B.V., 2010 Emerging active regions nationallicence Wave propagation simulation nationallicence SOHO/MDI observations nationallicence Helioseismology nationallicence Hartlep T. W.W. Hansen Experimental Physics Laboratory, Stanford University, Stanford, CA, USA aut Kosovichev A. W.W. Hansen Experimental Physics Laboratory, Stanford University, Stanford, CA, USA aut Zhao J. W.W. Hansen Experimental Physics Laboratory, Stanford University, Stanford, CA, USA aut Mansour N. NASA Ames Research Center, Moffett Field, CA, USA aut Solar Physics Springer Netherlands 268/2(2011-02-01), 321-327 0038-0938 268:2<321 2011 268 11207 https://doi.org/10.1007/s11207-010-9544-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11207-010-9544-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hartlep T. W.W. Hansen Experimental Physics Laboratory, Stanford University, Stanford, CA, USA aut NATIONALLICENCE 700 1- Kosovichev A. W.W. Hansen Experimental Physics Laboratory, Stanford University, Stanford, CA, USA aut NATIONALLICENCE 700 1- Zhao J. W.W. Hansen Experimental Physics Laboratory, Stanford University, Stanford, CA, USA aut NATIONALLICENCE 700 1- Mansour N. NASA Ames Research Center, Moffett Field, CA, USA aut NATIONALLICENCE 773 0- Solar Physics Springer Netherlands 268/2(2011-02-01), 321-327 0038-0938 268:2<321 2011 268 11207 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer