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Solar Physics

, Volume 251, Issue 1–2, pp 291–308 | Cite as

Helioseismology of Sunspots: Confronting Observations with Three-Dimensional MHD Simulations of Wave Propagation

  • R. CameronEmail author
  • L. Gizon
  • T. L. Jr. Duvall
Open Access
HELIOSEISMOLOGY, ASTEROSEISMOLOGY, AND MHD CONNECTIONS

Abstract

The propagation of solar waves through the sunspot of AR 9787 is observed by using temporal cross-correlations of SOHO/MDI Dopplergrams. We then use three-dimensional MHD numerical simulations to compute the propagation of wave packets through self-similar magnetohydrostatic sunspot models. The simulations are set up in such a way as to allow a comparison with observed cross-covariances (except in the immediate vicinity of the sunspot). We find that the simulation and the f-mode observations are in good agreement when the model sunspot has a peak field strength of 3 kG at the photosphere and less so for lower field strengths. Constraining the sunspot model with helioseismology is only possible because the direct effect of the magnetic field on the waves has been fully taken into account. Our work shows that the full-waveform modeling of sunspots is feasible.

Keywords

Sun: helioseismology Sun: sunspots Sun: magnetic fields 

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Copyright information

© The Author(s) 2008

Open AccessThis is an open access article distributed under the terms of the Creative Commons Attribution Noncommercial License (https://creativecommons.org/licenses/by-nc/2.0), which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.

Authors and Affiliations

  1. 1.Max-Planck-Institut für SonnensystemforschungKatlenburg-LindauGermany
  2. 2.Solar Physics LaboratoryNASA Goddard Space Flight CenterGreenbeltUSA

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