Nonlinear development of the kink instability in coronal flux tubes

Details Nonlinear development of the kink instability in coronal flux tubes Nonlinear development of the kink instability in coronal flux tubes

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...357..653c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 357, July 10, 1990, p. 653-661. Research supported by the New Zealand Unive

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33

Magnetic Energy Storage, Magnetohydrodynamic Stability, Solar Corona, Solar Flares, Solar Magnetic Field, Solar Prominences, Computerized Simulation, Coronal Loops, Magnetic Field Reconnection, Magnetic Flux

Scientific paper

This paper describes a Lagrangian numerical scheme for simulating nonlinear evolution of ideal MHD equilibria and applies it to an unstable finite Gold-Hoyle flux tube, line-tied to perfectly conducting endplates. The ensuing kink instability develops considerably faster than linear theory would predict, and eventually (over typically 100 Alfven time scales) a new kinked equilibrium is attained in which current sheets appear to be present. Little magnetic energy is lost in the ideal MHD phase, but resistive instabilities in the current sheets could lead to much more explosive energy release. Numerical studies of nonlinear interactions indicate that growth of the unstable kink mode is suppressed by the presence of other modes, which offers a possible explanation of the observed longevity of coronal loops.

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