Fruchtman A
Holon Academic Institute of Technology, 52 Golomb Street, Holon 58102, Israel.
Phys Rev Lett. 2006 Feb 17;96(6):065002. doi: 10.1103/PhysRevLett.96.065002. Epub 2006 Feb 14.
It is shown that the net momentum delivered by the large electric field inside a one-dimensional double layer is zero. This is demonstrated through an analysis of the momentum balance in the double layer at the boundary between the ionosphere and the aurora cavity. For the recently observed double layer in a current-free plasma expanding along a divergent magnetic field, an analysis of the evolution of the radially averaged variables shows that the increase of plasma thrust results from the magnetic-field pressure balancing the plasma pressure in the direction of acceleration, rather than from electrostatic pressure.
结果表明，一维双层内部大电场传递的净动量为零。这是通过对电离层与极光腔边界处双层中的动量平衡进行分析来证明的。对于最近在沿发散磁场扩展的无电流等离子体中观测到的双层，对径向平均变量的演化分析表明，等离子体推力的增加是由于磁场压力在加速方向上平衡了等离子体压力，而非来自静电压力。
