Electric currents and magnetic field loop structures of active regions on the Sun.
Abstract
Both, magnetic field loop structures and connection between electric currents and magnetic fields were studied on the basis of observational data for the magnetic field vector in λ5250 Å Fe I-line and Hα-pictures of two active regions. It is established that a considerable part of the photospheric transverse magnetic field depends on photospheric electric currents. In most cases the Hα-structure orientation do not coincide with projections of magnetic field lines calculated in the potential field approximation. Those few filaments that coincide with line projections, form three loop structure systems differing in height. The number of such filaments varies in the course of the active region evolution. It is concluded that the electric currents flow in the upper chromosphere and corona. The magnetic energy stored in local currents is extremely high and sufficient to produce most powerful flares.
- Publication:
-
Izvestiya Ordena Trudovogo Krasnogo Znameni Krymskoj Astrofizicheskoj Observatorii
- Pub Date:
- 1990
- Bibcode:
- 1990IzKry..82..108A
- Keywords:
-
- Electric Current;
- Lines Of Force;
- Solar Activity;
- Solar Magnetic Field;
- H Alpha Line;
- Plasma Dynamics;
- Solar Flares;
- Solar Physics;
- Solar Active Regions: Solar Magnetic Fields;
- Solar Coronal Loops: Solar Magnetic Fields;
- Solar Flares: Solar Magnetic Fields