Twisting motions in a disturbed solar filament
Abstract
Time sequences of the vertical velocity field in a disturbed solar active region filament (AR 2646) have been derived using the MSDP spectrograph operating in Hα at the Meudon Solar Tower. Following a period of systematic upward velocities a pair of closely aligned elongated regions of oppositely directed velocities develops and persists over several minutes. These velocities are interpreted in terms of a twisted magnetic flux rope model for the filament. The initial upward motions indicate that the flux rope is rising. This should lead to an expansion since the surrounding pressure is decreasing with height. Conservation of the current and the magnetic flux along the filament then requires twisting motions as the flux rope adjusts to a new radial equilibrium when rising into the corona.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- January 1985
- Bibcode:
- 1985A&A...142..249S
- Keywords:
-
- Coronal Loops;
- Magnetohydrodynamics;
- Solar Magnetic Field;
- Solar Oscillations;
- Solar Prominences;
- Stellar Spectrophotometry;
- Doppler Effect;
- H Alpha Line;
- Twisting;
- Solar Physics