Abstract
Different types of oscillatory motions were detected in the late phases of eruption of a prominence. We found oscillations of the prominence axis and diameter with periods of 4.3 and 9.1 min, corresponding to the eigenmodes m = 4 and m = 8 with a damping factor 4.6 × 10−3 s−1. A period about 4.5 min was found for oscillations of the pitch angle of the helically twisted filaments. The m = 2 and m = 3 eigenmodes could be also identified and they led to the final relaxation of the prominence axis. The observations are compared with a model in which we consider forces acting in a curved, cylindrical magnetic tube anchored at both ends in the photosphere and carrying an electric current. The stability of the prominence is discussed.
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Vršnak, B., Ruždjak, V., Brajša, R. et al. Oscillatory motions in an active prominence. Sol Phys 127, 119–128 (1990). https://doi.org/10.1007/BF00158517
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DOI: https://doi.org/10.1007/BF00158517