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Numerical simulation of dark lanes in post-flare supra-arcade View all abstracts by submitter

andrea costa   Submitted: 2009-10-02 17:14

We integrate the MHD ideal equations to simulate dark void sun wardly moving structures in post-flare supra-arcades. We study the onset and evolution of the internal plasma instability tocompare with observations and to gain insight into physical processes and characteristic parametersof these phenomena. The numerical approach uses a finite-volume Harten-Yee TVD scheme to integrate the 1D½ MHD equations specially designed to capture supersonic flow discontinuities.The integration is performed in both directions, the sunward radial one and the transverse to themagnetic field. For the first time, we numerically reproduce observational dark voids describedin Verwichte et al. (2005). We show that the dark tracks are plasma vacuums generated by thebouncing and interfering of shocks and expansion waves, upstream an initial slow magnetoacousticshock produced by a localized deposition of energy modeled with a pressure perturbation. The samepressure perturbation produces a transverse to the field or perpendicular magnetic shock giving riseto nonlinear waves that compose the kink-like plasma void structures, with the same functionalsunward decreasing phase speed and constancy with height of the period, as those determined bythe observations.

Authors: Costa, Andrea, Elaskar, Sergio, Fernández, Carlos, Martínez, Guadalupe
Projects: TRACE

Publication Status: Accepted MNRAS
Last Modified: 2009-10-05 09:42
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