Numerical simulations of penetration and overshoot in the sun

Tamara Rogers, Gary A. Glatzmaier, C. A. Jones

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

We present numerical simulations of convective overshoot in a two-dimensional model of the solar equatorial plane. The model equations are solved in the anelastic approximation with enhanced thermal conductivity and viscosity for numerical stability. The simulated domain extends from 0.001 to 0.93 R, spanning both convective and radiative regions. We show that convective penetration leads to a slightly extended, mildly subadiabatic temperature gradient beneath the convection zone, spanning approximately 0.05Hp, below which there is a rapid transition to a strongly subadiabatic region. A slightly higher temperature is maintained in the overshoot region by adiabatic heating from overshooting plumes. This enhanced temperature may partially account for the sound speed discrepancy between the standard solar model and helioseismology. Simulations conducted with tracer particles suggest that a fully mixed region exists down to at least 0.684 R .

Original languageEnglish (US)
Pages (from-to)765-773
Number of pages9
JournalAstrophysical Journal
Volume653
Issue number1 I
DOIs
StatePublished - Dec 10 2006
Externally publishedYes

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sun
penetration
helioseismology
numerical stability
two dimensional models
plumes
simulation
tracers
temperature gradients
convection
thermal conductivity
viscosity
heating
acoustics
approximation
temperature gradient
plume
tracer
temperature

Keywords

  • Convection
  • Sun: interior

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Numerical simulations of penetration and overshoot in the sun. / Rogers, Tamara; Glatzmaier, Gary A.; Jones, C. A.

In: Astrophysical Journal, Vol. 653, No. 1 I, 10.12.2006, p. 765-773.

Research output: Contribution to journalArticle

Rogers, Tamara ; Glatzmaier, Gary A. ; Jones, C. A. / Numerical simulations of penetration and overshoot in the sun. In: Astrophysical Journal. 2006 ; Vol. 653, No. 1 I. pp. 765-773.
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