| 空间尘埃等离子体中的重力波特性 |
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| 引用本文： | 蒋成进, 李芳. 空间尘埃等离子体中的重力波特性[J]. 地球物理学报, 2006, 49(5): 1250-1256, |
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| 作者姓名： | 蒋成进 李芳 |
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| 作者单位： | 1 中国科学院电子学研究所,北京 100080 2 中国科学院研究生院,北京 100049 |
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| 摘 要： | 建立尘埃等离子体中重力波的基本方程，推导尘埃等离子体中重力波的色散关系，分析地球极区中间层顶处尘埃等离子体层中的重力波特性，研究了重力波在电子密度垂直分层的尘埃等离子体中的反射. 结果表明尘埃等离子体改变了通常大气中的重力内波的色散关系，限制了小水平波数重力内波的传播，改变了波的能量特性，减小了重力波在不均匀大气中垂直向上传播时振幅的增长；在尘埃等离子体中传播时重力波可被电子密度垂直分层的结构反射而导致波能量的集中, 它产生的湍动所导致的空间电子密度的不均匀性分布是极区上空PMSEs的可能机制.
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| 关 键 词： | 尘埃等离子体 重力波 色散关系 反射 |
| 文章编号： | 0001-5733（2006）05-1250-07 |
| 收稿时间： | 2006-01-23 |
| 修稿时间： | 2006-01-232006-05-25 |
A study on properties of gravity waves in space dust plasma |
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| JIANG Cheng_Jin, LI Fang. A study on properties of gravity waves in space dust plasma[J]. Chinese Journal of Geophysics (in Chinese), 2006, 49(5): 1250-1256, |
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| Authors: | JIANG Cheng-Jin LI Fang |
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| Affiliation: | 1 Institute of Electronics of Chinese Academy of Sciences, Beijing 100080, China 2 Graduate University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | We establish a model of gravity waves in the dust plasma,derive their dispersion relation,and analyze the property of gravity waves in the dusty plasma layer at the mesospause above the polar region,and their reflection in the stratified dust plasma.The results show that,compared to the ordinary gravity waves,the dust plasma changes the dispersion relation,restricts the propagation of the gravity waves with small horizontal wave number,changes the wave energy property,and decreases the amplification of the gravity wave's amplitude when it propagates upward in the asymmetric atmosphere.When the gravity waves propagate in the dust plasma with stratified electron density,it can be reflected and lead to energy focusing which may cause turbulence.The irregularity of the electron created by the turbulence could be the mechanism of PMSEs above the polar region. |
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| Keywords: | Dust plasma Gravity wave Dispersion relation Reflection |
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