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EP: Extraterrestrische Physik

EP 1: Magnetosph
äre und Ionosph
äre

EP 1.1: Vortrag

Freitag, 4. März 2005, 10:00–10:15, TU BH349

Anomalous resistivity due to strongly nonlinear waves — •Jörg Büchner — Max-Planck-Institut, für Sonnensystemforschung, Max-Planck-Str.2, 37191 Katlenburg-Lindau

In collisionless plasmas anomalous transport due to the interaction of particles and electromagnetic field fluctuations outweighs the classical direct particle-particle interaction. For almost four decades the quasi-linear theoretical approach of Sagdeev, Dupree and others has dominated the field. Due to the necessarily low excitation level of the fluctuations, necessary in the quasilinear theory, the achieved anomalous transport is often too weak to explain observed dissipative phenomena. In particular we found obtained very high effective collision rates in CLUSTER experiments, which exceed the rates predicted by the quasilinear theory (see Poster by Panov et. al.).

We derived an analysis technique, which allows to consider strongly (as compared to the classical quasi-linear) non-linear wave-particle interactions and to derive the consequent anomalous resistivity for the lower hybrid plasma turbulence.