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第七讲：脉动与磁流体力学波

第七讲：脉动与磁流体力学波. 不同脉动种类的周期与频率范围. Pc-1 ： 0.2-5s, 0.2-5Hz Pi-1: 1-40s, 0.025-1Hz Pc-2 ： 5-10s,0.1-0.2Hz Pi-2: 40-150s,2-25mHz Pc-3: 10-45s,22-100mHz Pc-4: 45-150s,7-22mHz Pc-5: 150-600s, 2-7mHz. 磁流体力学的基本方程. 线性波方程.

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第七讲：脉动与磁流体力学波

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  1. 第七讲：脉动与磁流体力学波

  2. 不同脉动种类的周期与频率范围 Pc-1：0.2-5s, 0.2-5Hz Pi-1: 1-40s, 0.025-1Hz Pc-2：5-10s,0.1-0.2Hz Pi-2: 40-150s,2-25mHz Pc-3: 10-45s,22-100mHz Pc-4: 45-150s,7-22mHz Pc-5: 150-600s, 2-7mHz

  3. 磁流体力学的基本方程

  4. 线性波方程 假定波引起的扰动很下： 去除二阶小量，则有

  5. 冷等离子体中的波 假定背景物理量空间均匀，同时T=0，波动沿x方向传播，方程化为： 利用 ， 可得

  6. 假定B和k之间的交角为 ，则有 因此

  7. 阿尔芬波和压缩波的物理图像

  8. 温等离子体中的波 色散关系：

  9. 电离层边界条件 允许传播的阿尔芬的波长

  10. 偶极子磁场中的MHD波 允许传播的阿尔芬的波长

  11. 波能的来源 太阳风中的波动 磁层顶的K-H不稳定性 波和粒子相互作用

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