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Session 2 - Everything Else.
Display session, Friday, June 27
Ballroom C, Chair: Richard Canfield

[2.41] Nonlinear Evolution of Kink Unstable Magnetic Flux Tubes

M. G. Linton (Space Sciences Laboratory, UC Berkeley), R. B. Dahlburg (Naval Research Laboratory), D. W. Longcope (Montana State University), G. H. Fisher (Space Sciences Laboratory, UC Berkeley)

We investigate the kink instability of twisted magnetic flux tubes in the solar convection zone. The possibility that kinking flux tubes are responsible for the formation of some flare productive active regions provides the motivation for this work. We simulate the evolution of a twisted flux tube with a highly parallelized three dimensional MHD spectral code run on a 128 cubed grid. This code is run on the Naval Research Laboratory's CM500e. Our earlier work has shown that twisted magnetic flux tubes in the solar convection zone are linearly unstable to the kink mode for a wide range of conditions. These nonlinear simulations support the conclusions of our earlier linear work, showing that the tubes are unstable in the predicted regions and with the predicted growth rates. The simulations also allow us to follow the instability into the nonlinear regime, where it saturates and the tube settles into a new equilibrium configuration. We will describe the nonlinear evolution of the tube, it's eventual equilibrium configuration, and the implications this has for convection zone flux tubes.

This work was supported by NASA GSRP training grant NGT-51377, the NASA High Performance Computing and Communications Program, NSF grant AST-9528474 and NASA grant NAGW 3429. The numerical simulations were performed under a grant of time from the DoD HPC program.

Program listing for Friday