In this paper, the collision-induced instability at the cyclotron harmonics of the ordinary wave is studied under an assumption ν (v) _??_v
h, where the ν is the collision frequency with the neutral particles and v the electron velocity respectively. When the initial distribution of the electron velocity is a spherical shell in velocity space, it is found that the large value of the Larmor radius and/or wave number relaxes the restriction for the value h which leads to the instability and the growth rate increases with the electron density for the fixed ν and h.
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