Study of Nonlinear Wave-wave Interaction in the Ionospheric Plasma

电离层等离子体中非线性波-波相互作用的研究

• 批准号: 60580007
• 负责人: HAYAKAWA Masashi
• 金额: $ 1.34万
• 依托单位: Research Institute of Atmospherics, Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1985
• 资助国家: 日本
• 起止时间: 1985 至 1986
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-60580007/
• 关键词: Ionospheric plasma; The nonlinear wave-wave interaction; VLF transmitter signal; バイスペクトル解析

Among many wide-band(0-16kHz) VLF data observed on Aureol 3 satellite and telemetered onto the ground station of Sagadaira,we have found out an interesting new phenomenon which has never been reported so far. This phenomenon is associated with the high-power (500kwatts) VLF transmitter (called "Alpha station") signals from the eastern USSR. On the satellite, we have observed Doppler broadening of the spectrum on some occasions,and on other occasions, we have detected the side-band structures above and below the transmitter signal. The former phenomenon was already discovered by Stanford group a few years ago,but the latter phenomenon is a newly-found wave phenomenon. Based on the detailed spectral analysis and on the sophisticated bi-spectrum analysis,it is concluded that those side-band structures are the consequence of the nonlinear wave-wave interaction(three-wave process) between the very intense VLF transmitter signal and the ion wave(such as ion cyclotron harmonic wave) existing near the satellite.

在极光3号卫星观测到的大量宽带（0-16kHz） VLF数据中，我们发现了一个有趣的新现象，这是迄今为止从未报道过的。这种现象与来自苏联东部的大功率（500千瓦）VLF发射机（称为“阿尔法站”）信号有关。在卫星上，我们在某些情况下观察到频谱的多普勒展宽，在其他情况下，我们探测到发射机信号上方和下方的边带结构。前一种现象早在几年前就被斯坦福研究小组发现了，而后一种现象是一种新发现的波浪现象。通过详细的光谱分析和精密的双谱分析，认为这些边带结构是卫星附近存在的离子波（如离子回旋谐波）与甚高频发射信号非线性波-波相互作用（三波过程）的结果。

项目成果

Y.TANAKA: Journal of Geophysical Research. (1987)

Y.TANAKA：地球物理研究杂志。

Y.TANAKA: "Spectral broadening of VLF transmitter signals and sideband structure observed on Aureol 3 satellite at middle latitudes" Journal of Geophysical Research. (1987)

Y.TANAKA：“在中纬度 Aureol 3 卫星上观察到的 VLF 发射机信号的频谱展宽和边带结构”地球物理研究杂志。