A multimode investigation of granular and supergranular motions. I. Boussinesq model.
Abstract
The two types of large-scale convective motion in the sun, granulation and supergranulation, were studied theoretically based on a multi-mode expansion of the Boussinesq approximation. The basic hydrodynamic equations governing the convective motions are derived, assuming the Rayleigh number is variable with depth and is in excess of its linear value in the top 10 percent of the convective layer. Estimates of eddy conductivity, Prandtl number, and buoyancy in the convective layer are compared with observations and the results are discussed. Expansion of the theoretical calculations to a fully compressible model which takes into account the depth dependence of the parameters is briefly discussed.
- Publication:
-
Big-Bang Cosmology Symposium in honour of G. Lemaitre
- Pub Date:
- 1984
- Bibcode:
- 1984bbgl.symp..269V
- Keywords:
-
- Atmospheric Circulation;
- Boussinesq Approximation;
- Convection Currents;
- Solar Atmosphere;
- Solar Granulation;
- Stellar Models;
- Eddy Currents;
- Hydrodynamic Equations;
- Rayleigh Number;
- Solar Physics;
- Convection:Solar Granulation;
- Solar Granulation:Convection;
- Solar Granulation:Hydrodynamics