Plasma Electromagnetic Characteristics And Applications

This paper studies the electromagnetic properties of the plasma by the two examples—"The additional magnetic effect of plasma on muzzle electromagnetic induction setting system "and" The Blackout phenomenon of spacecraft re-entry procedure in deep space exploration".The paper analyzes the produced principium of muzzle plasma and calculates the electron density of the plasma for the small anti-aircraft artilleries in the live environment. According to the calculated plasma concentration of free electrons, we analyze the intensity and the regularity of the additional magnetic field produced by the air ionization, and the additional magnetic effects to the original magnetic field. This paper designs a specific experiment, which uses "Heavy piston compressor" to imitate the plasma generation on the actual working conditions. A method called contact plasma diagnostic method—"Microwave resonator probe measurements" is used to measure free electron density of the plasma. The experiment is used to prove that the theoretical analysis is reasonable. The results show that the additional magnetic field produced by muzzle plasma changes the distribution of original magnetic field lines and makes the parallel magnetic field lines into spiral-shaped distribution, which reduces the sensitivity of the electromagnetic induction setting system and it is very unfavorable for high reliability of the electromagnetic induction setting system.According to propagation characteristics of electromagnetic waves in a plasma, this article analyses the mechanism of Blackout phenomenon by spacecraft re-entry procedure in the deep space exploration and the absorption attenuation of Plasma Sheath on different frequency electromagnetic wave when the spacecraft is crossing through the different height of atmosphere. The results show that the blackout phenomenon will be inevitable because of the attenuation effects of the Plasma Sheath when the spacecraft re-enters into the atmosphere at a specific height and increase the frequency of electromagnetic wave can effectively reduce the height of the Blackout region, but there hasn't a complete method to eliminate the Blackout phenomenon.