Line-of-sight velocity measurements using a dissector-tube. III - Prominence oscillations
Abstract
We discuss the results of line-of-sight velocity observations in an active prominence and in three quiescent prominences. The observations were made by using a TV dissector-tube. At 2 x 3 arcsec spatial resolution the prominences showed oscillations in a wide range, from short-period (2-10 min) to long-period ones, covering a time span of 40-200 min. Short-period oscillations seem to refer to small-scale ones and are in their character close to oscillations occurring with the same periods in the chromosphere. Some interesting features of the line-of-sight velocity oscillations in the active prominence have been revealed. At the time of activation the amplitude of the short-period oscillations increases to exceed the level of quasi-hour oscillations. The range 2-20 min exhibits a transformation of the oscillation spectrum with height, from short to longer periods.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- March 1993
- Bibcode:
- 1993A&A...269..503M
- Keywords:
-
- Image Dissector Tubes;
- Line Of Sight;
- Solar Prominences;
- Velocity Measurement;
- Chromosphere;
- Solar Oscillations;
- Solar Physics