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- W2074611178 abstract "The effects of the finite current channel width on the current convective instability are studied both analytically and numerically. First, using a sharp boundary field-aligned current distribution which has a finite width along the plasma density gradient, the dispersion relation is obtained analytically. It is found that for the long wavelength modes (kyd ≪ 1) where the nonlocal effects are most prominent, the growth rate γ is proportional to |V¯dd/L2| in the collisional limit (νin ≫ |ω|), where d is the half width of the current channel, L is the plasma density gradient scale length, V¯d is the field-aligned current velocity, νin is the ion-neutral collision frequency, and ω is the perturbation frequency. For the long wavelength modes in the inertial limit (νin ≪ |ω|) the growth rate γ scales as |V¯dd/L2|α, where α = 1/2 (2/3) for kz²/ky² Ωe/νei much less than (greater than) |ω|/Ωi, kz(ky) is the wave number parallel (perpendicular) to the magnetic field, Ωe(Ωi) is the electron (ion) gyrofrequency, and νei is the electron-ion collision frequency. Numerical results are also presented for a diffuse boundary current velocity distribution. Applications to the high-latitude ionosphere are discussed." @default.
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- W2074611178 date "1985-01-01" @default.
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- W2074611178 title "Effects of finite current channel width on the current convective instability" @default.
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