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利用Spitzer的广义欧姆定律分析等离子体中由垂直于磁场的压强梯度所引起的宏观瞬变性质。在垂直于磁场方向的初始流动速度为零的条件下,得出在恒稳磁场中的瞬时扩散系数(当ωceτ?1)为 D= (2kmec2)/e2 T/(B2τ)+(kc)/eT/Be-me/(miτ)tsinωcit,式中τ为电子离子的平均碰撞时间间隔。In this paper, we investigate the macroscopic transient properties in plasma caused by a pressure gradient perpendicular to a constant magnetic field. Under the condition of zero initial flow velocity normal to the magnetic field, we get the instantaneous diffusion coefficient (when ωceτ?1) D= (2kmec2)/e2 T/(B2τ)+(kc)/eT/Be-(me t)/(mi τ)sinωcit, where τ is the mean collision time between an ion and an electron.
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