| 利用射线追踪方法研究化学物质释放对高频加热的聚焦效应 |
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| 引用本文： | 项薇,赵正予,胡耀垓.利用射线追踪方法研究化学物质释放对高频加热的聚焦效应[J].地球物理学报,2011,54(9):2201-2212. |
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| 作者姓名： | 项薇 赵正予 胡耀垓 |
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| 作者单位： | 武汉大学电子信息学院,武汉 430079 |
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| 基金项目： | 国家高技术研究发展计划(863计划)(2009AAxxx3202)资助. |
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| 摘 要： | 电离层化学物质释放能导致释放区域电子密度的损耗,从而产生明显的电离层空洞现象.高频电波通过电离层空洞时,由于电子密度不同,对电波产生折射效果进而形成聚焦效应.本文利用射线追踪方法,评估高频电波通过空洞形成聚焦加热的效果.结果表明,释放水分子与SF6都能对电离层产生明显的空洞,空洞半径约为25～50 km,电子密度的损耗...
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| 关 键 词： | 聚焦加热 电离层空洞 化学物质释放 高频加热 数字射线追踪 电波传播 |
| 收稿时间： | 2010-07-12 |
Research on the focusing effect of HF heating caused by the chemical release using ray tracing method |
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| XIANG Wei,ZHAO Zheng-Yu,HU Yao-Gai.Research on the focusing effect of HF heating caused by the chemical release using ray tracing method[J].Chinese Journal of Geophysics,2011,54(9):2201-2212. |
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| Authors: | XIANG Wei ZHAO Zheng-Yu HU Yao-Gai |
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| Institution: | School of Electronic Information,Wuhan University,Wuhan 430079,China |
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| Abstract: | The depletion of ionospheric electron density can be generated by the chemical material release, which is nominated as ionosphere hole. When the HF (high frequency) radio waves propagate through the hole, the refraction of the HF radio waves due to the electron density gradient might form a focusing effect. In this paper the effects of ionospheric focus heating by HF radio wave propagation through ionosphere hole are evaluated using the numerical ray tracing method. The leading numerical results are as follows. Release of H2O and SF6 is able to produce an obvious hole in the ionosphere with radius of 25~50 km approximately; the electron density's attenuation rate is above 10%, which can sometimes achieve 90% nearby the release point. Additionally chemical materials of different mole number release can also bring different effects. Focusing effects could reach the best performance at 300 km height by releasing 100 mol H2O when the frequency of the high power radio waves is 15 MHz. Due to the focusing effects, the amplitude of wave energy absorption may raise about 10 dB, which is a twofold increase. After the focused heating the electron temperature may increase approximately 20% than the normal HF heating. |
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| Keywords: | Focused heating Ionospheric hole Chemical material release HF heating Numerical ray tracing radio propagation |
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