Electromagnetic cyclotron instabilities in bi-Kappa distributed plasmas : a quasilinear approach

Lazar, M. and Yoon, P.H. and Eliasson, B. (2017) Electromagnetic cyclotron instabilities in bi-Kappa distributed plasmas : a quasilinear approach. Physics of Plasmas, 24 (4). 042110. ISSN 1070-664X

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    Abstract

    Anisotropic bi-Kappa distributed plasmas, as encountered in the solar wind and planetary magnetospheres,are susceptible to a variety of kinetic instabilities including the cyclotron instabilities driven by an excess ofperpendicular temperature T⊥ > T∥ (where ∥, ⊥ denote directions relative to the mean magnetic field). Theseinstabilities have been extensively investigated in the past, mainly limiting to a linear stability analysis. Abouttheir quasilinear (weakly nonlinear) development some insights have been revealed by numerical simulationsusing PIC and Vlasov solvers. This paper presents a self-consistent analytical approach, which provides forboth the electron and proton cyclotron instabilities an extended picture of the quasilinear time evolution ofthe anisotropic temperatures as well as the wave energy densities.