磁倾角对电离层Alfven谐振器影响的初步研究

Preliminary study of effects introduced by the dip angle on IAR

研究了在考虑磁场倾斜情况下,ULF波(0.1—10 Hz)从磁层到地面的传播,得到此情况下ULF波的解析解.分析了倾斜磁场对电离层Alfven谐振器各种参数如反射系数、谐振频率、衰减率的影响.数值模拟分析结果表明,磁倾角的变化导致标高以及电离层电导率的改变,进而影响IAR的参数.随着磁倾角的减小,谐振频率与IAR的衰减降低,并且衰减最大值对应的电离层电导率也减小.

The propagation of ULF waves （0.1-10 Hz） from magnetosphere to the conductive ground is studied in the presence of oblique magnetic field and the analytical solution is obtained. The effects on the parameters of the IAR, such as reflection coefficient, eigenfrequency and attenuation, are analyzed. It is shown by simulation that the change of oblique field results in the corresponding change of the scale length and the ionospheric conductivities. Along with the decrease of dip angle, the eigenfrequency declines and so does the attenuation of IAR. The conductivity corresponding to the maximum attenuation also decreases.