Oscillatory motions in an active prominence

Details Oscillatory motions in an active prominence Oscillatory motions in an active prominence

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990soph..127..119v&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 127, May 1990, p. 119-128.

Physics

20

Magnetic Flux, Solar Oscillations, Solar Prominences, Eigenvectors, Electric Current, Photosphere

Scientific paper

Different types of oscillatory motions were detected in the late phases of eruption of a prominence. Oscillations of the prominence axis and diameter were found with periods of 4.3 and 9.1 min, corresponding to the eigenmodes m = 4 and m = 8. 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 forces acting in a curved, cylindrical magnetic tube anchored at both ends in the photosphere and carrying an electric current are considered. The stability of the prominence is discussed.

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