极区电极流调制实验研究  

Experimental study ofelectrojet modulation in polar region

作　　者：杨巨涛[1] 李清亮[1] 郝书吉[1] 陈靓 闫玉波[1] 马广林[1] YANG JuTao;LI QingLiang;HAO ShuJi;CHEN Jing;YAN YuBo;MA GuangLin(National Key Laboratory of Electromagnetic Environment,China Research Institute of Radiowave Propagation,Qingdao 266107,China)

机构地区：[1]中国电波传播研究所,电波环境特性及模化技术重点实验室,青岛266107

出　　处：《地球物理学报》2022年第1期137-144,共8页Chinese Journal of Geophysics

基　　金：中国博士后科学基金(2020M672307);中国电波传播研究所稳定支持科研经费项目(A132001W07)资助.

摘　　要：本文基于2017—2019年我国在EISCAT开展的极区电极流调制实验数据,分析加热波功率和极化,以及激发频率和接收位置对调制加热激发的ELF/VLF电磁波强度的影响,分析结果表明:(1)随着加热波功率等级的增加,激发的ELF/VLF电磁波强度增加,其功率因子取值范围为0.5~2.3;(2)相对O波,加热波极化采用X波时更有利于ELF/VLF电磁波的激发,两者的差值在3.6~13.9 dB内变化;(3)随着激发频率的增加,辐射ELF/VLF电磁波强度先增大后减小,且在2 kHz附近及其谐波附近具有最大值;(4)电极流调制激励的ELF/VLF电磁波在地球-电离层波导中传播不具有方向性,辐射波由15 km传输到208 km时,信号幅度衰减超过12 dB.In this paper,the influence of heating wave power and polarization,excitation frequency and receiving position on the intensity of ELF/VLF electromagnetic wave excited by modulation heating are analyzed,based on the experimental data of electrojet modulation carried out at EISCAT from 2017 to 2019.The results show that:(1)with the increase of heating wave power level,the intensity of ELF/VLF electromagnetic wave increases,and its power factor is 0.5~2.3;(2)compared with O-wave,X-wave is more conducive to the excitation of ELF/VLF electromagnetic wave,and the difference between them varies from 3.6 to 13.9 dB;(3)with the increase of excitation frequency,the intensity of radiated ELF/VLF electromagnetic wave first increases and then decreases,and has a maximum value near 2 kHz and its harmonics;(4)the ELF/VLF electromagnetic wave excited by electrojet modulation has no directionality in the earth ionospheric waveguide,and the signal amplitude attenuation is more than 12 dB when the radiated waves are transmitted from 15 km to 208 km.

关 键 词：电极流调制 极低频/甚低频 加热波功率 加热波极化 激发频率 传播衰减 

分 类 号：P352[天文地球—空间物理学]