Düsseldorf 2007 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

P: Fachverband Plasmaphysik

P 7: Poster

P 7.13: Poster

Montag, 19. März 2007, 16:30–18:30, Poster A

The momentum transfer rate due to current-driven turbulence in magnetized plasma — •Nina Elkina, Kuang Wu Lee, and Joerg Buechner — Max-Planck-Institut für Sonnensystemforschung, Max-Planck-Str.2, 37191 Katlenburg-Lindau, Germany

Up to now, it is still unclear that which mechanism causes the violation of frozen-in condition locally, which leads to magnetic field reconnection. It has been assumed that some kinds of plasma instabilities occur in current layers and generate anomalous resistivity because of the effective wave-particle interactions, and consequently reduce the electric current. The focuses of this study are to derive momentum transfer rate in strong turbulence case due to wave-particle interactions (*anomalous* resistivity) and the inertial effects relating the formation of large amplitude structures, such as double layer, which sustains strong potential drop in Debay scale. We have obtained the spectra of linearly unstable modes around ion-acoustic and lower-hybrid frequencies which peaked along the direction parallel to drift and to magnetic field with a spreading angle. On early stage of instability development, the main contibution into turbulence energy level is coming from the field-aligned wave modes. Further evolution of these waves lead to the development of planar double layers. On second stage one can see preferential growth of oblique modes. We calculate the effective resistivity due to any term in generalized Ohm’s law and consider their relative importances on reducing current. In this study we discuss possible ways to include turbulence induced dissipation into a macroscopic model of solar coronal reconnection.