地基ELF线天线在地-电离层壳体中产生的场

为了研究地震产生的机理, 需要分析和研究地基极低频(Extreme-Low Frequency, ELF)电磁波的传播特性.地基任意ELF线天线产生的电磁场可由ELF点源产生的电磁场进行叠加.通过地基ELF点源电磁场的表达式导出了ELF线天线在地-电离层壳体中电磁场的表达式.利用加速收敛算法得到了单条和两条ELF线天线产生电磁场的场强空间分布图, 用色标表示场强值在空间分布的强弱.电场水平分量的场强值要比垂直分量的场强值小, 磁场水平分量的场强值要比垂直分量的场强值大.而且两条线天线产生的场强值要比单条线天线产生的场强值大.

Fields excited by groundsill ELF linear antenna in earth-ionosphere cavity

To study the mechanism of the earthquake production,we need to study the propagation characteristics of the groundsill extreme-low frequency(ELF)electromagnetic wave.The electromagnetic fields excited by the groundsill ELF arbitrary linear antenna may be the sum of the electromagnetic fields excited by the ELF dot sources.The expressions of electromagnetic fields excited by the groundsill ELF linear antenna in earth-ionosphere cavity are derived from the expressions of the electromagnetic fields ex-cited by the ELF dot sources.The field intensity spatial distribution maps of the electromagnetic fields ex-cited by the ELF single linear antenna and two linear antennas are obtained by the speed numerical conver-gence algorithm.The strong and weak field intensity values in the spatial distribution are expressed by the color code.The field intensity values of the horizontal electric field component are less than those of the vertical component,whereas,the field intensity values of the horizontal magnetic field component are lar-ger than those of the vertical component.Furthermore,the field intensity values excited by two linear an-tennas are larger than those excited by the single linear antenna.