On the transition between the Weibel and the whistler instabilities

Details On the transition between the Weibel and the whistler instabilities On the transition between the Weibel and the whistler instabilities

2010-08-15

arxiv.org/abs/1008.2539v1

Plasma Phys. Control. Fusion 52 (2010) 095007

Physics

Plasma Physics

11 pages

Scientific paper

10.1088/0741-3335/52/9/09500

The transition between non resonant (Weibel-type) and resonant (whistler) instabilities is investigated numerically in plasma configurations with an ambient magnetic field of increasing amplitudes. The Vlasov-Maxwell system is solved in a configuration where the fields have three components but depend only on one coordinate and on time. The nonlinear evolution of these instabilities is shown to lead to the excitation of electromagnetic and electrostatic modes at the first few harmonics of the plasma frequency and, in the case of a large ambient magnetic field, to a long-wavelength, spatial modulation of the amplitude of the magnetic field generated by the whistler instability.

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