Collision-Induced Instability at Cyclotron Harmonics

概要

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The collision-induced instability at the cyclotron harmonics of the ordinary wave is studied under an assumption ν(V)∝V^h, where ν is the electron collision frequency with neutral particles and V the electron velocity, respectively. When the initial distribution of the electron velocities is a spherical shell in velociry space, it is found that the large values of μ=(Larmor radius)×(wave number) relax the restriction of h which leads to the instability and the condition h=3 is sufficient to generate the instability at the higher cyclotron harmonics if μ is chosen suitably. Furthermore, the growth rate increases with the electron density for given ν and h, and it attains the maximum at ω_p⪆ω_c, where ω_p and ω_c are the plasma and the cyclotron frequencies, respectively.
社団法人日本物理学会の論文
1968-12-05