摘要
利用全波解模型进行数值模拟实验,研究了具有不同辐射源参数(辐射频率和功率)的地面甚低频(Very Low Frequency,VLF)辐射源在不同地磁场参数(地磁场强度和倾角)和电离层参数(电子密度和碰撞频率)条件下激发的地球-电离层波导和电离层中的电磁场能量空间分布,并重点研究了电离层D/E区对电磁辐射能量的吸收.模拟结果发现:VLF辐射在波导中衰减只受辐射源频率的影响,不受辐射功率、地磁场参数和电离层参数变化影响,波导中的衰减随频率的增大而减小,而电离层D/E区吸收随频率增大而增大,两者总衰减量随频率增大而增大.辐射源功率对电离层D/E区的吸收也无影响.地磁强度和地磁倾角越大,电离层D/E区吸收越小;电离层碰撞频率和电子密度越大,电离层中能量衰减越大.
The spatial distribution of electromagnetic field excited by ground-based VLF transmitters with different radiation frequency and power under different geomagnetic parameters and ionospheric pa-rameters are stimulated using the full-wave model constructed in this paper.Focusing on the absorption in the D/E region of the ionosphere,we can conclude that the attenuation of VLF radiation in the waveguide is only affected by the wave frequency in the near field which decreases with the increase of the wave fre-quency,while the D/E region absorption and total attenuation increase with wave frequency.The variation of the radiation power has no effect on the attenuation in the waveguide and the D/E region absorption. The D/E region absorption decreases with the increase of the geomagnetic field and the dip angle of the ge-omagnetic field.The D/E region absorption increases with ionospheric electron density and collision fre-quency.
出处
《电波科学学报》
EI
CSCD
北大核心
2016年第5期825-833,共9页
Chinese Journal of Radio Science
基金
国家国际科技合作对俄科技合作专项(2014DFR21280)
中国地震局地震预测研究所基本科研业务费专项(2015IES0101)
亚太空间合作项目
ISSI-BJ项目联合资助
关键词
地基
VLF
人工源
全波解
电离层吸收
ground-based VLF transmitter
full-wave solution
ionosphere absorption
