磁流体波的穿透对地表电磁环境的影响

Influence of Penetration of Magnetohydrodynamic Waves on Surface Electromagnetic Environment

本文用两点边值问题的方法数值求解了磁流体波在穿透中纬度电离层和大气层的传播,给出了其对地表电磁环境的影响。在假设磁流体竖直入射,并且大地为理想导体的边界条件下,运用IMSL的子程序BVPFD计算给出了数值结果,数值结果显示磁流体波在穿透电离层和大气层的传播过程中,电场在低电离层和大气层逐渐衰减,在地面达到零,而磁场能够穿透电离层和大气层而到达地面,但在到达地面时衰减了一个量级。这对我们改善环境电磁辐射的监测,去除电磁监测过程中的本底干扰具有一定的启示参考作用。

The method of two-point boundary value problem is used for numerical solution of the transmission of magnetohydrodynamic wave when it penetrates the ionosphere and atmosphere at middle latitude,and its influence on surface electromagnetic environment is obtained.At the conditions that the magnetohydrodynamic wave is assumed to incident vertically and the earth was considered as a perfect conductor,the BVPFD,subprogram of IMSL,was applied to calculate numeric solution.The numeric result showed that during the process of magnetohydrodynamic wave penetrating the ionosphere and atmosphere,the electric field decayed gradually in lower ionosphere and atmosphere until became zero at the earth surface.Simultaneously,the magnetic field was able to penetrate the ionosphere and atmosphere to reach the earth surface where it reduced by one order of magnitude.This result provides references for improvement of monitoring electromagnetic radiation and removal of the disturbance of background.