【摘要】 在非理想导电地面与电离层条件下,导出了SLF/ELF水平电偶极子在球形地-电离层壳体中产生的电磁场的球谐级数表达式,采用一种加速收敛算法,算出了波导中的电磁场分布。根据计算结果,在SLF频段,地面与电离层之间的电磁场可理解为两个"行波"的叠加,且与SLF频段的球面二阶近似算法计算结果吻合很好。在ELF频段,壳体中的电磁场是驻波,其频率变化规律能正确反映出"舒曼"谐振现象。更多还原

【Abstract】 The spherical harmonic series expressions of electromagnetic fields excited by ELF/SLF horizontal electric dipole in spherical Earth-ionosphere guide when earth and ionosphere are regarded as the imperfectly electric conductor has been derived.A method to improve the speed of convergence has been presented.The electromagnetic fields in the cavity have been calculated by this algorithm.From the result,electromagnetic fields between earth and ionosphere are the sum of two travelling wave in SLF band.Moreover,it perfectly agrees with the result of famous spherical second order approximation in SLF band.The electromagnetic fields in the guide are a kind of standing wave in ELF band.The variation of the amplitude verse frequency coincides with the Schumann resonance.更多还原