Peculiar photospheric velocity fields and magnetic energy build-up
Abstract
The in situ storage of magnetic energy was studied in a linear force-free arcade sheared by a relative velocity between its footpoints. The photospheric velocity fields used are related to sunspots proper motions and to the solar differential rotation pattern. Results indicate that sunspot proper motions are efficient in magnetic energy build-up and that the values of the stored magnetic energy in a region characterized by rigidly rotating structures coupled with new born sunspots may be sufficient to allow flaring activity. It is concluded that the anomalies in the solar angular velocity pattern may have an important role in the magnetic energy build-up.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- April 1992
- Bibcode:
- 1992A&A...257..298Z
- Keywords:
-
- Photosphere;
- Solar Atmosphere;
- Solar Magnetic Field;
- Solar Rotation;
- Velocity Distribution;
- Angular Velocity;
- Force-Free Magnetic Fields;
- Solar Flares;
- Sunspots;
- Solar Physics