电子学报 ›› 2020, Vol. 48 ›› Issue (12): 2319-2325.DOI: 10.3969/j.issn.0372-2112.2020.12.005

• 学术论文 • 上一篇    下一篇

电离层中ELF辐射源向下传播衰减理论分析

杨巨涛1,2, 李清亮1,2, 郝书吉1,2, 董慧1,2   

  1. 1. 中国电波传播研究所青岛分所, 山东青岛 266107;
    2. 电波环境特性及模化技术重点实验室, 山东青岛 266107
  • 收稿日期:2019-09-05 修回日期:2020-04-23 出版日期:2020-12-25 发布日期:2020-12-25
  • 作者简介:杨巨涛 男,1982年生于湖南.现为中国电波传播研究所高级工程师,主要研究方向为电波传播和等离子体物理.E-mail:yyjt521@126.com;李清亮 男,1963年生于河南.现为中国电波传播研究所研究员,中国电子科技集团公司集团首席科学家.主要研究方向为电波传播,空间环境调控技术,目标及其环境特性等.E-mail:liql220103@126.com;郝书吉 男,1978年生于河南.现为中国电波传播研究所研究员.主要研究方向为电波传播、空间环境调控技术等;董慧 女,1978年生于河北.现为中国电波传播研究所高级工程师.主要研究方向为电波传播、数值分析与仿真等.
  • 基金资助:
    中国电科技术创新基金(No.KJ1602004);电波环境特性及模化技术重点实验室基金(No.6142403180308)

Theoretical Analysis of Downward Propagation Attenuation of ELF Radiation in Ionosphere

YANG Ju-tao1,2, LI Qing-liang1,2, HAO Shu-ji1,2, DONG Hui1,2   

  1. 1. China Research Institute of Radiowave Propagation, Qingdao, Shandong 266107, China;
    2. National Key Laboratory of Electromagnetic Environment, Qingdao, Shandong 266107, China
  • Received:2019-09-05 Revised:2020-04-23 Online:2020-12-25 Published:2020-12-25

摘要: 利用大功率高频(HF)电波调制加热电离层可在电离层中有效形成辐射源,并用于辐射ELF电磁波.本文基于磁流体力学的基本方程通过对电离层中极低频(ELF)辐射源的辐射场分析,获得ELF电磁波在电离层中传播的色散关系式,建立电离层中的ELF辐射源向下传播衰减模型.并依据建立的传播衰减模型,分析不同纬度地区传播衰减的差异,以及传输频率和背景电离层参数对传播衰减的影响.

关键词: 电离层辐射源, 极低频, 色散关系, 相对衰减率, 传播衰减模型, 衰减特性

Abstract: Sources and resultant radiations of extremely low frequency (ELF) electromagnetic waves can be effectively generated via modulated heating of the ionosphere by powerful high-frequency (HF) waves.With fundamental equations of magneto-hydrodynamics,the radiation field of the ELF radiation source in the ionosphere is derived.The dispersion relation of ELF waves propagating in the ionosphere is then obtained and the downward propagation attenuation model is established.According to this model,the differences of propagation attenuation in distinct latitudes and influences of transmitting frequency and ambient ionospheric parameters on propagation attenuation are analyzed.It is shown that the relative attenuation rate is raised with increase of the geomagnetic inclination and firstly rises and then falls with increase of the transmission frequency,resulting in an optimal transmission frequency value at which the relative attenuation rate reaches minimum.With enhancement of electron density or electron temperature,the relative attenuation rate rises and its growth rate drops.

Key words: ionospheric radiation source, extremely low frequency, dispersion relation, relative attenuation rate, propagation attenuation model, attenuation characteristics

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