Self-consistent theory of turbulent transport in the solar tachocline: III. Gravity waves

Eun Jin Kim, N. Leprovost

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Aims. To understand the fundamental physical processes important for the evolution of solar rotation and distribution of chemical species, we provide theoretical predictions for particle mixing and momentum transport in the stably stratified tachocline. Methods. By envisioning that turbulence is driven in the tachocline, we compute the amplitude of turbulent flow, turbulent particle diffusivities, and eddy viscosity, by incorporating the effect of a strong radial differential rotation and stable stratification. We identify the different roles that the shear flow and stable stratification play in turbulence regulation and transport. Results. Particle transport is found to be severely quenched due to stable stratification, as well as radial differential rotation, especially in the radial direction with an effectively more efficient horizontal transport. The eddy viscosity is shown to become negative for parameter values typical of the tachocline, suggesting that turbulence in the stably stratified tachocline leads to a non-uniform radial differential rotation. Similar results also hold in the radiative interiors of stars, in general.

Original languageEnglish
Pages (from-to)1025-1031
Number of pages7
JournalAstronomy and Astrophysics
Volume468
Issue number3
DOIs
Publication statusPublished - 1 Jun 2007
Externally publishedYes

Bibliographical note

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Keywords

  • Sun: interior
  • Sun: rotation
  • Turbulence
  • Waves

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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