A convective model of solar granulation
Abstract
A convective numerical model of solar granulation is developed. The full nonlinear equations of finite-amplitude convection in a compressive medium with polytropic structure derived by Van der Borght (1977) in the one-mode approximation are integrated numerically for specific boundary conditions. The results are presented in a table listing upper-boundary velocity, flux modulation, the percentage of total flux carried by granules, and the e-folding time for Prandtl numbers 0.2, 0.24, and 0.5. The best fit to observations is obtained at Prandtl number 0.2, where the table parameters are 0.97 km/sec, 16.37 percent, 4.2 percent, and 6.0 min, respectively.
- Publication:
-
Publications of the Astronomical Society of Australia
- Pub Date:
- 1983
- Bibcode:
- 1983PASA....5..166V
- Keywords:
-
- Convection;
- Solar Granulation;
- Stellar Models;
- Nonlinear Systems;
- Numerical Integration;
- Polytropic Processes;
- Prandtl Number;
- Solar Physics