Oscillatory and transient features detected simultaneously in the CA II K and H-beta line spectra of a quiescent prominence

Details Oscillatory and transient features detected simultaneously in the CA II K and H-beta line spectra of a quiescent prominence Oscillatory and transient features detected simultaneously in the CA II K and H-beta line spectra of a quiescent prominence

Feb 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990pasj...42..187s&link_type=abstract

Astronomical Society of Japan, Publications (ISSN 0004-6264), vol. 42, no. 1, 1990, p. 187-203.

Astronomy and Astrophysics

Astronomy

16

Line Spectra, Solar Oscillations, Solar Prominences, Solar Spectra, Calcium, Doppler Effect, Emission Spectra, H Beta Line, Potassium, Power Spectra, Line Profile Analyses, Oscillations, Quiescent Prominences, Temperature, Transient Motions

Scientific paper

Oscillatory time variations have been found in the line of sight Doppler velocity both in the Ca II K and Hβ lines at a faint edge-region of a quiescent prominence. The periods are about 240 and 830 5. Long-period variations of about 1 hr have also been detected at the same region in the Doppler velocity, integrated intensity, and line width. Moreover, a transient velocity variation of about 10 min time-span and 6 km s-1 amplitude has been found at a region between the main bodies of the prominence. There is evidence that the temperature starts to increase before the Doppler velocity starts to increase in the case of the long-period variation, while the increases of temperature and Doppler velocity occur at the same time in the case of the transient feature. The possibility is suggested that some of the long-period oscillations might result from recurrent activation with heating in some part of the prominence, although short-period oscillations are not inconsistent with Alfvén-wave-like ones.

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