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考虑到等离子体片和等离子体幔的存在,我们从Vlasov方程出发得出一个自洽的二维磁尾平衡模式。在这个模式中,假设等离子体处于平衡状态,压强是各向同性的,还假设沿磁尾方向各种参数的变化率较垂直于等离子体片方向的变化率要小得多。晨昏方向的变化则完全忽略不计。 这个模式体现出磁尾的一些主要结构要素:(ⅰ)高温等离子体组成的等离子片;(ⅱ)等离子体片中的闭合磁力线;(ⅲ)等离子体极其稀薄的磁尾瓣;(ⅳ)等离子体幔;(ⅴ)磁层顶;(ⅵ)张开的磁尾。 讨论了等离子体幔的存在对磁尾平衡结构的影响,结论是等离子体幔的存在使磁尾的形状更趋于尾形,于是,至少部分克服了Birn模式的困难。
Considering the existence of the plasma sheet and the plasma mantle, we derive a self-consistent two-dimensional magnetocluster equilibrium model from the Vlasov equation. In this mode, assuming that the plasma is in equilibrium and the pressure is isotropic, it is also assumed that the rate of change of various parameters along the magnetotail direction is much less than the rate of change perpendicular to the direction of the plasma sheet. Twilight direction changes are completely ignored. This mode shows some of the major structural elements of the magnet tail: (i) a plasma sheet of high temperature plasma; (ii) a closed magnetic field line in the plasma sheet; (iii) a magnetically tailing plasma that is extremely thin; (iv) a plasma Body mantle; (ⅴ) Magnetosphere; (ⅵ) Open magnetic tail. The effect of the existence of plasma mantle on the magnetic tail balance structure is discussed. The conclusion is that the existence of the plasma mantle makes the shape of the magnet tail more tail-shaped, and at least partially overcomes the difficulties of Birn mode.