Self-consistent formation of electron $\kappa$ distribution: 2. Further numerical investigation

Physics

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Interplanetary Physics: Energetic Particles (7514), Interplanetary Physics: Plasma Waves And Turbulence, Interplanetary Physics: Solar Wind Plasma, Interplanetary Physics: General Or Miscellaneous

Scientific paper

In the preceding article (Yoon et al., 2006) the basic physics behind the generation of suprathermal electrons (the $\kappa$ distribution) by means of self-consistent processes is elucidated. In this followup paper, further numerical investigation of the electron $\kappa$ formation is carried out. In particular, the underlying input physical parameters which include the plasma parameter g = 1/$\hat{nλD3, the electron beam-to-background density ratio, $\hat{nb/$\hat{n, the electron-to-ion temperature ratio, Te/Ti, and the ratio of average beam speed to electron thermal speed, V0/vTe, are systematically varied. It is shown that the electron suprathermal tail formation takes place over a wide range of physical parameters. It is also found that the formation of suprathermal tail appears to exhibit critical behavior in that there is a threshold beam energy below which no suprathermal population is formed, but when the energy threshold is crossed, the tail generation is greatly facilitated.

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