Signatures of Emerging Subsurface Structures in Acoustic Power Maps of the Sun

T. Hartlep, A. G. Kosovichev, J. Zhao, N. N. Mansour

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)321-327
Number of pages7
JournalSolar Physics
Issue number2
StatePublished - Feb 2011
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Emerging active regions
  • Helioseismology
  • SOHO/MDI observations
  • Wave propagation simulation


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