Magnetic loops with current in the vicinity of H-alpha flares
Abstract
The relationship of flare and flocculus knots with H-alpha fibrils, electric currents, and magnetic fields is investigated on the basis of observations of the total vector of the magnetic field and vertical currents computed from them, as well as H-alpha films of two active regions (ARs). It is found that knots of flares are either connected with each other or with the flocculus knot by the magnetic loops bearing the currents. The shortest loops connect the brightest knots. The places where magnetic loops converge with current (from both close and very remote areas in the AR) are characterized by the most powerful flare activity. It is concluded that the total energy store of the AR is the source of flare energy. A dynamical model of a flare based on current redistribution in the system of ascending loops and a concentration of current in a loop with minimum ascent velocity is proposed.
- Publication:
-
Izvestiya Ordena Trudovogo Krasnogo Znameni Krymskoj Astrofizicheskoj Observatorii
- Pub Date:
- 1991
- Bibcode:
- 1991IzKry..83....3A
- Keywords:
-
- Electric Current;
- H Alpha Line;
- Solar Flares;
- Solar Magnetic Field;
- Dynamic Models;
- Magnetic Field Configurations;
- Plasma Conductivity;
- Solar Physics