Periodic oscillations found in the velocity field of a quiescent prominence |
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| Authors: | Tokio Tsubaki Akitsugu Takeuchi |
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| Institution: | (1) Department of Earth Science, Shiga University 2-5-1 Hiratsu, 520 Otsu, Japan;(2) Present address: Department of Astronomy, University of Kyoto, Sakyo-ku, 606 Kyoto, Japan |
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| Abstract: | With the purpose of detecting periodic oscillations or waves in a quiescent prominence, temporal variations of a Ca ii K line profile have been studied. The most conspicuous phenomenon found here is the fact that the edge of the prominence showed, over some 20000 km along the spectrograph-slit, periodic velocity fluctuations of nearly the same phase with periods of 210–240 s and with an amplitude of up to ± 2 kms –1. At other portions, several different periods of peaks (160–400 s) can also be seen in the power spectra, but less distinctly. As to the intensity and the line width, however, no periodic variations have been detected. |
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