| 地面VLF波穿透电离层的能量衰减变化 |
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| 引用本文： | 赵庶凡,廖力,张学民.地面VLF波穿透电离层的能量衰减变化[J].地球物理学报,2017,60(8):3004-3014. |
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| 作者姓名： | 赵庶凡 廖力 张学民 |
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| 作者单位： | 1. 中国地震局地震预测研究所, 北京 100036;2. 中国地震局地球物理研究所, 北京 100081 |
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| 基金项目： | 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）、亚太空间合作项目以及ISSI-BJ项目联合资助. |
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| 摘 要： | 地面VLF人工源可以导致辐射带高能粒子沉降.为研究辐射带粒子加速和沉降机制,乃至实现对辐射带电子"人工控制"的设想,需要在精确计算得到VLF人工源在电离层激发电磁场能量分布的基础上,计算哨声波对辐射带电子的调制作用.以往计算VLF人工源在电离层中激发的电磁场能量分布多基于Cary给出的波导中VLF波衰减率和Helliwell提出的经典电离层吸收曲线,但近期研究表明,这些模型结果存在较为明显的误差.本研究建立了地面VLF信号穿透电离层传播的全波计算模型,将计算结果与DEMETER卫星记录的NWC通讯台激发的电磁响应进行对比.虽然模型没有考虑电离层参数水平不均匀性,但模型计算结果与卫星观测值也有较好的一致性.利用经过验证的全波模型计算了不同地磁参数、电离层参数情况下,不同辐射特性的地面VLF辐射在波导中的衰减和穿透电离层时D/E区的吸收值,探讨了上述参数对电磁波能量在波导和D/E区中衰减的影响规律.
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| 关 键 词： | 地基VLF人工源 DEMETER卫星 电离层渗透模型 全波解 电离层吸收 |
| 收稿时间： | 2016-06-29 |
Trans-ionospheric VLF wave power absorption of terrestrial VLF signal |
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| ZHAO Shu-Fan,LIAO Li,ZHANG Xue-Min.Trans-ionospheric VLF wave power absorption of terrestrial VLF signal[J].Chinese Journal of Geophysics,2017,60(8):3004-3014. |
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| Authors: | ZHAO Shu-Fan LIAO Li ZHANG Xue-Min |
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| Institution: | 1. Institute of Earthquake Science, China Earthquake Administration, Beijing 100036, China;2. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China |
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| Abstract: | Ground based Very Low Frequency (VLF,3~30 kHz) transmitters have played an important role in precipitation of energetic particles. In the past, the contribution of VLF electromagnetic waves to radiation belt losses was quantitatively calculated based on the early models of trans-ionospheric, such as the Helliwell absorption curve. Recent studies have indicated that the calculation results of these models have obvious errors in estimating the trans-ionospheric absorption. In this study, a full-wave model of trans-ionospheric propagation of VLF waves was constructed to calculate the electromagnetic distribution excited by the NWC communication station and compared with DEMETER satellite records. Although the horizontal inhomogeneity of the ionosphere was not considered in this full-wave model, the calculation results are still comparable with observations. The attenuation of the electromagnetic energy in the earth-ionosphere waveguide and the absorption in the D/E region with different geomagnetic parameters, ionospheric parameters and different radiation sources was calculated with the verified full-wave model, which permitted to further study the effects of these parameters. |
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| Keywords: | Ground-based VLF transmitter DEMETER satellite Trans-ionospheric model Full-wave solution Ionosphere absorption |
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