On motions in some chromospheric fibrils.
Abstract
The line-of-sight velocities in the Hα line in some fibrils, connecting the spots, pores and flocculi with magnetic fields of opposite polarities and in some superpenumbra fibrils have been measured. It is shown, that investigated fibrils are arch structures, because mainly two types of their motions are observed; 1) the matter is descending all over the fibril, except for a small section on the top, where gas is ascending with velocity 1 - 6 km/sec. The descending gas velocity is growing smoothly from the top of the fibril to its ends, where it reaches 10 - 60 km/sec; 2) the gas flows from one end of the fibril to the other with 10 - 60 km/sec velocity. The descending gas velocity is being changed on both ends of fibrils simultaneously. During the flare development the gas ascending velocity toward the top of the fibril is growing, but the gas descending velocity on both ends of the fibril is decreasing.
- Publication:
-
Izvestiya Ordena Trudovogo Krasnogo Znameni Krymskoj Astrofizicheskoj Observatorii
- Pub Date:
- 1990
- Bibcode:
- 1990IzKry..82..116K
- Keywords:
-
- Chromosphere;
- Plasma Dynamics;
- Solar Activity;
- Filaments;
- Line Of Sight;
- Radial Velocity;
- Solar Flares;
- Solar Physics;
- Solar Chromosphere: Gas Motions;
- Solar Chromosphere: Structure