Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...321..921s&link_type=abstract
Astronomy and Astrophysics, v.321, p.921-926
Astronomy and Astrophysics
Astrophysics
17
Sun: Prominences, Oscillations
Scientific paper
Time variations of Doppler shifts of the Ca^+^ 8542Å emission in quiescent solar prominences have been measured. A new type of 'limb guider' assures a highly constant distance of the spectrograph slit from the solar limb and furthermore removes low frequency image motion in the direction perpendicular to the slit. Remaining image motion along the slit is usually removed by a correlation of subsequent spectra. This procedure, however, cannot be applied globally to the whole spatial height in the spectra if individual structures exhibit lateral motions along the slit or even decay or arise during the observation. We therefore correlate defined individual emission maxima from successive spectra. The finally obtained power spectra show oscillations with a variety of periods at restricted locations. The data favour the known general presence of periods near 20 and 60-min, however they give only slight indication for `typical' periods near 3 and 5 min.
Bianda Michele
Kueveler G.
Suetterlin Peter
Wiehr Eberhard
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