Darmstadt 2008 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P IV: Poster: Niedertemperaturplasmen II, Astrophysikalische Plasmen, Magnetischer Einschluss, Plasma-Wand-Wechselwirkung

P IV.1: Poster

Donnerstag, 13. März 2008, 16:00–18:30, Poster C2

Experimental studies of magnetic flux ropes — •Holger Stein¹, Jan Tenfelde¹, Lukas Arnold², Jürgen Dreher², Rainer Grauer², and Henning Soltwisch¹ — ¹Institut für Experimentalphysik V, Ruhr-Universität Bochum, 44780 Bochum, Germany — ²Lehrstuhl für Theoretische Physik I, Ruhr-Universität Bochum, 44780 Bochum, Germany

The FlareLab project at Bochum University is a concerted experimental and numerical effort to study the dynamics of magnetic flux ropes reminiscent of arc-shaped solar prominences. Following previous work of Hansen and Bellan [1], an arc-shaped discharge is used for the generation of the magnetic flux ropes. The main diagnostics are a fast ICCD camera with an exposure time of 5 ns and pick-up coils to measure the magnetic field created by the flux ropes. The key observations are: i) pinching of the flux rope, ii) expansion of the current arc and iii) kink-like structures deforming the arc. Concomitantly numerical simulations are performed to analyse the observations in detail. The magneto-hydrodynamic equations are utilised for the plasma description, and three-dimensional numerical solutions are computed on an adaptive mesh [2]. Observations of the magnetic probe measurements are discussed and a new design of the plasma source based on a model of Titov and Démoulin [3] is presented.

[1] J.F. Hansen and P.M. Bellan, Astrophys. J. Lett. 563, L183 (2001) [2] J. Dreher and R. Grauer, Parallel Computing 31, 913-932 (2005) [3] V.S. Titov and P. Démoulin, A&A, 351, 707 (TD) (1999)