Line-of-sight velocity measurements using a dissector-tube. III - Prominence oscillations

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 l...

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Published in:Astronomy and astrophysics (Berlin) 1993-03, Vol.269 (1-2), p.503-508
Main Authors: Mashnich, G P, Druzhinin, S A, Pevtsov, A A, Levkovskij, V I
Format: Article
Language:English
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Summary: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.
ISSN:0004-6361