Numerical MHD Simulations of Solar Magnetoconvection and Oscillations in Inclined Magnetic Field Regions

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

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

The sunspot penumbra is a transition zone between the strong vertical magnetic field area (sunspot umbra) and the quiet Sun. The penumbra has a fine filamentary structure that is characterized by magnetic field lines inclined toward the surface. Numerical simulations of solar convection in inclined magnetic field regions have provided an explanation of the filamentary structure and the Evershed outflow in the penumbra. In this article, we use radiative MHD simulations to investigate the influence of the magnetic field inclination on the power spectrum of vertical velocity oscillations. The results reveal a strong shift of the resonance mode peaks to higher frequencies in the case of a highly inclined magnetic field. The frequency shift for the inclined field is significantly greater than that in vertical-field regions of similar strength. This is consistent with the behavior of fast MHD waves.

Original languageEnglish (US)
Pages (from-to)283-291
Number of pages9
JournalSolar Physics
Volume268
Issue number2
DOIs
StatePublished - Feb 2011
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Granulation
  • Oscillations: solar
  • Sunspots: penumbra, magnetic fields

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