Abstract
The fine structure of the quiescent prominence of 15 October 1969, observed at Abastumani Astrophysical Observatory of the Academy of Sciences of Georgia, U.S.S.R. with the horizontal telescope, is studied. The complex non-gaussian Ca+ K line profiles are decomposed into gaussian components and the distribution of the velocity field is plotted. Estimating the direction of the motion by the appearance of the spectral line and by the distribution of the velocity field, we conclude that there is a left-handed screw. Having used the high dispersion spectral data published, we find that prominences showing left-handed screws fall in the northern hemisphere of the Sun and those with right-handed screws in the southern hemisphere. The influence of Coriolis acceleration on quiescent prominences is discussed.
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