Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...269..503m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 269, no. 1-2, p. 503-508.
Astronomy and Astrophysics
Astrophysics
8
Image Dissector Tubes, Line Of Sight, Solar Prominences, Velocity Measurement, Chromosphere, Solar Oscillations
Scientific paper
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.
Druzhinin S. A.
Levkovskij V. I.
Mashnich G. P.
Pevtsov Alexander
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