On the relationship between magnetic field and velocity field in a sunspot.
Abstract
The paper deals with studying the relationship between magnetic fields and velocity fields in sunspots at the early stage of their development using observations with the vector magnetograph of the Sayan Observatory. It is pointed out that when the maps of the magnetic field's longitudinal component and the radial velocity are superimposed, the maximum velocity in the sunspot region corresponds mainly to the magnetic field zero line. A dependence of the radial velocity on the slope of the magnetic field vector to the line of sight is investigated. The approximation of cylindrical symmetry is used to reconstruct the velocity and magnetic field vectors for the leading sunspot of the group SD 135/1984. The results obtained testify the existence of two systems of motions. The matter within the sunspot is moving mainly across the magnetic field lines, but the sunspot umbra involves the region in which the directions of the magnetic field and of mass motion are the same.
- Publication:
-
Kinematika i Fizika Nebesnykh Tel
- Pub Date:
- June 1987
- Bibcode:
- 1987KFNT....3Q...3G
- Keywords:
-
- Matter (Physics);
- Solar Magnetic Field;
- Sunspots;
- Velocity Distribution;
- Magnetic Signatures;
- Plasma Dynamics;
- Radial Velocity;
- Solar Physics;
- Magnetic Fields:Sunspots;
- Sunspots:Magnetic Fields;
- Sunspots:Velocity Fields