Periodic oscillations found in the velocity field of a quiescent prominence

Details Periodic oscillations found in the velocity field of a quiescent prominence Periodic oscillations found in the velocity field of a quiescent prominence

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986soph..104..313t&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 104, April 1986, p. 313-320.

Physics

41

Solar Oscillations, Solar Prominences, Solar Velocity, Calcium, Fourier Analysis, Line Spectra, Oscillations, Solar Spectra, Temporal Distribution

Scientific paper

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 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.

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