| 参量激励过程中三波耦合的一般色散关系(Ⅰ)最容易激励参量不稳定性的频率和波矢条件 |
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| 引用本文： | 赵正予,魏寒颖.参量激励过程中三波耦合的一般色散关系(Ⅰ)最容易激励参量不稳定性的频率和波矢条件[J].空间科学学报,2004,24(6):441-447. |
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| 作者姓名： | 赵正予 魏寒颖 |
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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863资助项目(2002AA733101) |
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| 摘 要： | 讨论了在各向同性的均匀无耗电离层背景下激励参量不稳定性的三波耦合过程．首先从波的非线性耦合理论出发，分析入射电磁波和多个等离子体本征波模间的耦合情况；然后得到了无耗情况下参量激励过程满足的色散关系，在激励等离子体波的临界情况下表现为两种频率和波矢匹配条件，进而从理论上证明最容易激励参量不稳定性的条件是耦合生成电子Langmuir波和离子声波．
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| 关 键 词： | 色散关系 不稳定性 参量 离子声波 耦合 本征 等离子体波 频率 电离层 电磁波 |
| 修稿时间： | 2003年10月28 |
GENERAL DISPERSION RELATION FOR THE THREE-WAVE PROCESS OF PARAMETRIC EXCITATION (I) The Preferred Excitation of an Electron Langmuir Wave and an Ion Acoustic Wave |
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| ZHAO Zhengyu WEI Hanying.GENERAL DISPERSION RELATION FOR THE THREE-WAVE PROCESS OF PARAMETRIC EXCITATION (I) The Preferred Excitation of an Electron Langmuir Wave and an Ion Acoustic Wave[J].Chinese Journal of Space Science,2004,24(6):441-447. |
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| Authors: | ZHAO Zhengyu WEI Hanying |
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| Abstract: | Three-wave coupling process in parametric excitation is well studied under an isotropic, homogenous and collisionless ionospheric background. First discussed is the nonlinear coupling between ionospheric eigen oscillations with the presence of incident electromagnetic wave. Then, the dispersion relation of parametric excitation process in collisionless ionosphere is deduced, and two kinds of frequency conditions and wave-vector conditions are obtained for critical excitation of parametric insta bility. It is proved theoretically that the excitation of an electron Langmuir wave and an ion acoustic wave when parametric instabilities occur is the easiest tendency due to the minimum energy consumption. |
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| Keywords: | Parametric instability Pump wave Plasma wave |
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