| 高纬极区电离层中离子声波谱线增强的解释 |
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| 引用本文： | 薛昆,吴健,徐彬,郭立新.高纬极区电离层中离子声波谱线增强的解释[J].空间科学学报,2010,30(1). |
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| 作者姓名： | 薛昆 吴健 徐彬 郭立新 |
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| 作者单位： | 1. 中国电波传播研究所,电波环境特性及模化技术国家级重点实验室,青岛,266107
2. 西安电子科技大学理学院 |
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| 基金项目： | 国家自然科学基金重点项目资助(40831062) |
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| 摘 要： | 大量的实验研究表明,在顶部极光区电离层,利用EISCAT非相干散射雷达和Millstone Hill雷达可以观测到不对称、增强的离子声波谱线.考虑到低能H~+离子束沉降到背景电离层,以及电离层顶部O~+离子的外流事件,采用含有场向热流项的双麦克斯韦分布描述H~+离子束的分布函数,进而基于离子-离子双流不稳定性理论来解释增强的离子声波谱线.场向热流的引入可以减小离子声波谱线的不对称现象,这样得到的结果更符合实际.
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| 关 键 词： | 离子声波谱线 离子-离子双流不稳定性 非相干散射雷达 |
Interpretation on the Origin of Enhanced Ion Acoustic Line Spectra in the High Ionosphere |
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| XUE Kun,WU Jian,XU Bin,GUO Lixin.Interpretation on the Origin of Enhanced Ion Acoustic Line Spectra in the High Ionosphere[J].Chinese Journal of Space Science,2010,30(1). |
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| Authors: | XUE Kun WU Jian XU Bin GUO Lixin |
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| Institution: | National Key Laboratory of Electromagnetic Environment/a>;China Research Institute of Radiowave Propagation/a>;Qingdao 266107;School of Science/a>;Xidian University |
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| Abstract: | A number of observations showing enhanced ion acoustic echoes observed in the topside auroral ionosphere by means of both the EISCAT and Millstone Hill radars have been reported in the literature.The received power,often asymmetric,is extremely enhanced by up to 1 or 2 orders of magnitude above usual values,and it is mostly contained in one of the two ion acoustic lines.The instability processes have been proposed in many literatures to explain these phenomena,and one of the theories is the ion-ion two-stre... |
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| Keywords: | Ion acoustic line spectra Ion-ion two-stream instability Incoherent scatter radar |
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