Inclined features in the H-alpha spectral line in active regions on the solar disk
Abstract
Radial velocities and their gradients were measured in 270 dispersion-inclined and some other spectral features in the H-alpha line in active regions on the solar disk. The location of each feature is determined with respect to the fine structure of the chromosphere and photosphere. It is shown that in most cases inclined spectral features are formed as a result of differentiated motions of matter at different sites of fine-structure elements of the chromosphere such as loops or loop systems and are chiefly observed near the footpoints of these formations. An important role in the formation of the inclined features is played by opposing matter motions in the adjacent fine-structure elements of the chromosphere. Most of the inclined features are observed in flare-active regions, which is explained by increase of velocities and their gradients caused by flare activity.
- Publication:
-
Izvestiya Ordena Trudovogo Krasnogo Znameni Krymskoj Astrofizicheskoj Observatorii
- Pub Date:
- 1991
- Bibcode:
- 1991IzKry..83...12K
- Keywords:
-
- H Alpha Line;
- Radial Velocity;
- Solar Activity;
- Solar Magnetic Field;
- Chromosphere;
- Magnetic Flux;
- Photosphere;
- Solar Physics