We propose a method of applying a static magnetic field to reduce the attenuation of the magnetic field component (S _H) of low-frequency electromagnetic (LF EM) waves in dense plasma. The principle of this method is to apply a static magnetic field to limit electron movement, thereby increasing the equivalent resistance and thus reducing the induced current and S _H. We consider the static magnetic field acting on the plasma of the entire induced current loop rather than on the local plasma, where the induced current is excited by the magnetic field component of LF EM waves. Analytical expressions of S _H suitable for magnetized cylindrical enveloping plasma are derived by adopting an equivalent circuit approach, by which S _H is calculated with respect to various plasma parameter settings. The results show that S _H can be reduced under a static magnetic field and the maximum magnetic field strength that mitigates blackout is less than 0.1 T. Experiments in which LF EM waves propagate in a shock-tube-generated magnetized cylindrical enveloping plasma are also conducted. S _H measured under the magnetic field (the magnetic field strength B ₀ acting on the magnetic field probe was about 0.06 T) reduces at f=10 MHz and f=30 MHz when n _e≈1.9נ10¹³ cm⁻³, which is consistent with theoretical results. The verification of the theory thus suggests that applying a static magnetic field with a weak magnetic field has the potential to improve the transmission capacity of LF EM waves in dense plasma.

我们提出了一种施加静磁场的方法，以减少致密等离子体中低频电磁 (LF EM) 波的磁场分量 ( S _H )的衰减。这种方法的原理是施加静磁场来限制电子运动，从而增加等效电阻，从而降低感应电流和S _H。我们考虑静磁场作用于整个感应电流回路的等离子体，而不是作用于局部等离子体，其中感应电流由低频电磁波的磁场分量激发。采用等效电路法推导出适用于磁化圆柱包络等离子体的S _{H 的}解析表达式，其中S _H是根据各种等离子体参数设置计算的。结果表明，在静磁场作用下，S _H可以降低，减轻停电的最大磁场强度小于0.1 T。 还进行了低频电磁波在激波管产生的磁化圆柱形包络等离子体中传播的实验. 在磁场下测得的S _H（作用在磁场探头上的磁场强度B ₀约为 0.06 T）在f =10 MHz 和f =30 MHz处减小，当n _e ≈1.9נ10 ¹³ cm ^-3，与理论结果一致。因此，该理论的验证表明，施加带有弱磁场的静磁场有可能提高 LF EM 波在致密等离子体中的传输能力。