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P: Fachverband Plasmaphysik

P 10: Theory and Modelling I

P 10.3: Vortrag

Dienstag, 3. März 2015, 11:15–11:30, HZO 50

The marginal instability condition of the aperiodic ordinary mode for counter-stream bi-Maxwellian distribution function — •Sergei Vafin and Reinhard Schlickeiser — Institut für Theoretische Physik, Lehrstuhl IV: Weltraum- & Astrophysik, Ruhr-Universität, Bochum, Germany

In situ observations of solar wind temperature anisotropy do not fit predictions in the low parallel plasma beta regime. At the same time the aperiodic O-mode might be additionally destabilized at low plasma betas by counter-streams, which implies an excess of free energy in the direction parallel to the ordered magnetic field. This fact has been recently discovered analytically and confirmed numerically, solving the dispersion equation of O-mode for both equal-mass and electron proton plasmas, assuming different counter-stream parameter scalings. The marginal instability condition exhibits a sensitive behaviour on a counter-stream parameter scaling and under certain assumptions can explain the observations.