Magnetic field and radiation characteristics of plasma induced by hypervelocity impact on aluminum alloy

Plasma will be formed during hypervelocity impact and accompanied by electromagnetic radiation ranging from low frequency to high frequency. It is a significant physical phenomenon under strong impact loadings and the main cause of electromagnetic damage suffered by spacecraft. This paper focused on the aluminum alloy and established the model of the magnetic field based on the movement of the plasma and the Biot-Savart law. The magnitude and microwave radiation characteristics of the induced magnetic field under different collision velocities and target thicknesses were analyzed. It is found that the magnetic field generated by the plasma expansion has a high frequency in a form of pulsed oscillation. The maximum magnetic induction intensity, the power spectral density of electronic oscillation and the total energy of microwave radiation are positively correlated with the collision velocity. The thinner the target is, the greater the magnetic induction intensity, the shorter the duration of the strong pulse and the smaller the power spectral density and the total energy of the microwave radiation will be.