Oscillations of a loop prominence preceding a limb flare |
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| Authors: | J McKim Malville Mark Schindler |
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| Institution: | (1) Department of Astro-Geophysics, University of Coloradov at Boulder, 80309, Colo., U.S.A. |
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| Abstract: | Observations of a limb flare and an associated loop prominence were obtained in H with the 512 channel magnetograph of the Kitt Peak National Observatory. Simultaneous radial and torsional oscillations with a period near 75 s, wavelength of 37 000 km, and amplitude of 1–2 km s–1 were detected in the loop approximately 90 min before the onset of the flare. We interpret these coupled oscillations in terms of a kink instability of a current carrying flux tube. The magnitude of the steady-state component of current is estimated to be 6 × 1010 ampères.Visiting Astronomer, Kitt Peak National Observatory, operated by Aura, Inc., under contract with the National Science Foundation.Visiting Student, Kitt Peak National Observatory. |
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