Periodic oscillations found in the velocity field of a quiescent prominence

✍ Scribed by Tokio Tsubaki; Akitsugu Takeuchi

• Publisher: Springer
• Year: 1986
• Tongue: English
• Weight: 569 KB
• Volume: 104
• Category: Article
• ISSN: 0038-0938
• DOI: 10.1007/bf00159084

✦ Synopsis

With the purpose of detecting periodic oscillations or waves in a quiescent prominence, temporal variations ofa CaII 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-s/it, periodic velocity fluctuations of nearly the same phase with periods of 210-240 s and with an amplitude of up to + 2 km s -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.