日环食对低频及甚低频电波传播的影响  

The Influence of the Annular Solar Eclipse on the Propagation of the LF-VLF Radio Waves

作　　者：潘炼德 苗永瑞[1] 王发潮 王素琴[1] 彭金凤 

机构地区：[1]中国科学院陕西天文台 [2]中国科学院广州人卫站

出　　处：《电波科学学报》1990年第1期38-43,共6页Chinese Journal of Radio Science

摘　　要：对经过几条不同的路径传播的低频(100KHz)或甚低频(10.2KHz)信号的相位和(或)幅度在1987年9月23日日环(或偏)食期间的变化进行了观测。结果表明,信号相位均落后于正常时的相应值,并在食甚后1.5至2.5分钟内均达极大。信号幅度均先增强,在食甚前6.5至8.5分钟内达极大,然后减少,在食甚后6至14分钟内达极小。信号相位和幅度均在复圆阶段基本恢复正常状态。此外,相位及幅度的极大变化量基本上与食甚时刻的食分值正相关。以上变化特点反映了日食导致的电离层 D 层有关过程、D 层电子密度结构以及低频(甚低频)信号传播过程的相应变化。The observations of the variations of the phases and amplitudes of the radio si- gnals at LF(100KHz)or VLF.(10.2KHz),which propagated through different pa- ths,have been conducted during the annular solar(or partial)eclipse of 23 Septem- ber 1987.The results show that the phases of all the signals lag behind compared to the corresponding normal phases,and reached the maximum within 1.5-2.5 minutes after the maximum eclipse time.As to the amplitudes of the signals,they increase at first and reached the maximum within 6.5-8.5 minutes before the maximum eclipse time and then decreased and reached the minimum within 6-14 minutes after the maximum eclipse time.Both the phase and the amplitude recover to the normal state basically around the eclipse end.Beside,the positive correlation exists between the maximum of the variation of the phase or the amplitude of the signals and the eclipse factor for the maximum eclipse time.All the variation characteristics mentioned above appear to reflect the corresponding variations of the relevant processes taking place in the ionospheric D layer of the electron density structure of the ionospheric D layer and of the propagation of the radio waves at LF(VLF),which are resulted from the solar eclipse.

关 键 词：电波传播 日环食 低频 

分 类 号：TN011[电子电信—物理电子学]