Numerical modeling of solar convection and oscillations in magnetic regions

I. N. Kitiashvili, L. Jacoutot, A. G. Kosovichev, A. A. Wray, N. N. Mansour

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Scopus citations

Abstract

Solar observations show that the spectra of turbulent convection and oscillations significantly change in magnetic regions, resulting in interesting phenomena, such as high-frequency "acoustic halos" around active regions. In addition, recent observations from SOHO/MDI revealed significant changes of the wave properties in inclined magnetic field regions of sunspots, which affect helioseismic inferences. We use realistic 3D radiative MHD numerical simulations to investigate properties of solar convection and excitation and propagation of oscillations in magnetic regions. A new feature of these simulations is implementation of a dynamic sub-grid turbulence model, which allows more accurate description of turbulent dissipation and wave excitation. We present the simulation results for a wide range of the field strength and inclination in the top 6 Mm layer of the convection zone. The results show interesting and unexpected effects in the dynamics and large-scale organization of the magnetoconvection (including traveling waves and shearing flows) and also changes in the excitation properties and spectrum of oscillations, suggesting an explanation of the acoustic "halos" observed above the acoustic cut-off frequency.

Original languageEnglish (US)
Title of host publicationStellar Pulsation
Subtitle of host publicationChallenges for Theory and Observation - Proceedings of the International Conference
Pages569-573
Number of pages5
DOIs
StatePublished - Dec 1 2009
Externally publishedYes
EventInternational Conference on Stellar Pulsation: Challenges for Theory and Observation - Santa Fe, NM, United States
Duration: May 31 2009Jun 5 2009

Publication series

NameAIP Conference Proceedings
Volume1170
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

OtherInternational Conference on Stellar Pulsation: Challenges for Theory and Observation
CountryUnited States
CitySanta Fe, NM
Period5/31/096/5/09

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Keywords

  • Convection, oscillations
  • Sun: Mhd simulations
  • Sunspots

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