Theoretical Studies of Low-Frequency Instabilities in the Ionosphere

电离层低频不稳定性的理论研究

• 批准号: 9812679
• 负责人: Yakov Dimant
• 金额: --
• 依托单位: Cornell University
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-07-15 至 2001-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9812679&HistoricalAwards=false
• 关键词: Theoretical; Studies; Low; Frequency; Instabilities

The main objective of the proposed work is to develop a quantitative theory of plasma turbulence in the lower ionosphere that will incorporate dynamical and self-organizational features. Different regimes of nonlinear saturation of the instabilities are expected resulting in different quantitative characteristics of the developed turbulence. A new dynamical-statistical approach for description of nonlinear saturation of the instabilities will be applied. Based on a consistent kinetic theory developed earlier, a quantitative theory of electron heating by the low-frequency turbulence in strongly perturbed auroral regions will be developed. Both analytical and numerical methods will be employed in these studies. It is expected that the proposed theory will explain turbulence features observed by radar backscattering and rocket mounted instruments, as well as some features found in recent numerical simulations. Based on theoretical results, suggestions for future experiments will be proposed. The general results of these studies and the unconventional analytical approach to the description of turbulence may be employed in other fields of knowledge.

拟议工作的主要目标是发展低电离层等离子体湍流的定量理论，该理论将结合动力学和自组织特征。 不同的不稳定性非线性饱和状态预计会导致所发展的湍流的不同定量特征。 将应用一种新的动态统计方法来描述不稳定性的非线性饱和。 基于早期发展的一致动力学理论，将发展强扰动极光区域中低频湍流电子加热的定量理论。 这些研究将采用分析方法和数值方法。 预计所提出的理论将解释雷达后向散射和火箭安装仪器观察到的湍流特征，以及最近数值模拟中发现的一些特征。 根据理论结果，将对未来的实验提出建议。这些研究的一般结果和描述湍流的非常规分析方法可以应用于其他知识领域。