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Oscillations of a loop prominence preceding a limb flare

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Abstract

Observations of a limb flare and an associated loop prominence were obtained in Hα 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.

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Authors and Affiliations

  1. Department of Astro-Geophysics, University of Coloradov at Boulder, 80309, Colo., U.S.A.

    J. McKim Malville & Mark Schindler

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  1. J. McKim Malville
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  2. Mark Schindler
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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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Malville, J.M., Schindler, M. Oscillations of a loop prominence preceding a limb flare. Sol Phys 70, 115–128 (1981). https://doi.org/10.1007/BF00154395

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  • DOI: https://doi.org/10.1007/BF00154395

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