The modes of oscillation of a prominence. III. The slab in a skewed magnetic field

Details The modes of oscillation of a prominence. III. The slab in a skewed magnetic field The modes of oscillation of a prominence. III. The slab in a skewed magnetic field

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...277..225j&link_type=abstract

Astronomy and Astrophysics, Vol. 277, p. 225 (1993)

Astronomy and Astrophysics

Astrophysics

33

Magnetohydrodynamics - Sun: Magnetic Fields - Sun: Prominences

Scientific paper

We consider theoretically the possible modes of oscillation of a solar quiescent prominence, treating the prominence as a plasma slab embedded in a uniform, line-tied magnetic field that is inclined at a small angle (≍2O°) to the long axis of the slab. Particularly interesting is the appearance of a string Alfvén mode that is analogous to the fundamental mode of vibration of a stretched string loaded with a heavy mass at its centre. This mode, along with a slow internal mode of the slab, may correspond to the observed long period (40-90 min) oscillation of quiescent prominences. Intermediate periodicities, in the range 8-20 min, may be associated with an internal Alfvén mode and a fast string mode. Short periodicities, in the range 2-5 min, may be due to an internal fast mode in the prominence slab.

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