Numerical 3-D simulations of the collapse of photospheric flux tubes
Abstract
The interaction of photospheric granular convection with a small scale magnetic field has been simulated numerically in a three-dimensional model, with an extension of techniques recently used to simulate field-free granulation. The evolution of an initially homogeneous magnetic field was followed numerically, both in a kinematic (weak-field limit) description, and in a dynamic description, where the back-reaction of the field on the motion through the Lorentz force is taken into account. The simulations illustrate the strong tendency for the field to be swept up and concentrated in the inter-granular lanes because of the topology of the granular flow. The convectively unstable stratification allows field concentration up to a kilogauss field because of the temperature reduction in the magnetic plasma.
- Publication:
-
Solar and Stellar Magnetic Fields: Origins and Coronal Effects
- Pub Date:
- 1983
- Bibcode:
- 1983IAUS..102...79N
- Keywords:
-
- Convective Flow;
- Photosphere;
- Solar Granulation;
- Solar Magnetic Field;
- Kinematics;
- Magnetohydrodynamic Flow;
- Stellar Models;
- Three Dimensional Models;
- Topology;
- Solar Physics