Investigations of the HF Ionospheric Modification Process at Arecibo

阿雷西博高频电离层修改过程的研究

基本信息

批准号：
9529392
负责人：
Frank Djuth
金额：
$ 24.05万
依托单位：
Geospace Research Inc
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
1996
资助国家：
美国
起止时间：
1996-04-15 至 2001-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9529392&HistoricalAwards=false
关键词：
Investigations HF Ionospheric Modification Process

项目摘要

The PI will focus on high-frequency (HF) radio wave modification of the F-region ionosphere using the upgraded HF facility near Arecibo. He will pay particular attention to fundamental wave-plasma interactions in the ionospheric medium and the use of controlled ionospheric perturbations to elucidate natural aeronomic processes. The research will be timed with the solar sunspot cycle so that experiments can be performed in two distinct ionospheric environments: the nighttime, summer ionosphere (providing a highly stable plasma for controlled experimentation), and the nighttime, winter ionosphere (low collisional loss rates give rise to macroscale temperature/electron density modifications). Basic plasma processes the PI will address include the resonant excitation of Langmuir oscillations and ion waves, so he can fully explore wave-plasma interactions in the 50-ms interaction interval following turn-on of the HF beam in a cold unmodified plasma. He will advance current theories beyond the first 50 ms of modification by investigating how HF-induced plasma irregularities/structures impact wave propagation and altering the evolutionary path of the plasma turbulence. The PI will examine plasma transport phenomena and elastic/inelastic electron collision frequencies in the nighttime ionosphere with HF-induced perturbations. The array of observations this project proposes will be made mainly at Arecibo, but with supplementary processors from GRI.

PI将使用Arecibo附近的升级的HF设施对F区电离层进行高频（HF）无线电波修饰。他将特别关注电离层培养基中的基本波超血相互作用，并使用受控的电离层扰动来阐明自然气管过程。这项研究将与太阳能黑子周期进行计时，以便可以在两个不同的电离层环境中进行实验：夜间，夏季电离层（为受控实验提供高度稳定的等离子体），夜间电离层（冬季电离层低碰撞率（低碰撞率）会导致摩克舞会温度/电子密度的调整）。基本血浆过程PI将要解决的问题包括Langmuir振荡和离子波的共振激发，因此他可以在冷的未修饰的血浆中的HF梁转旋后完全探索50毫秒相互作用间隔中的波质量增强相互作用。他将通过研究HF诱导的血浆不规则/结构影响波传播并改变等离子体湍流的进化路径，将当前理论超过修饰的前50毫秒。 PI将在夜间电离层中使用HF诱导的扰动检查血浆转运现象和弹性/非弹性电子碰撞频率。该项目提出的一系列观察结果将主要在Arecibo进行，但使用GRI的补充处理器进行。