Instabilities Associated with an Electron Beam in the Presence of Intrinsic Alfven Waves

存在本征阿尔芬波时与电子束相关的不稳定性

• 批准号: 9802498
• 负责人: Ching-Sheng Wu
• 金额: $ 14.31万
• 依托单位: University of Maryland, College Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-05-01 至 2000-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9802498&HistoricalAwards=false
• 关键词: Instabilities; Associated; Electron; Beam; Presence

The investigators continue their work on an alternative radio emission theory, involving no Langmuir waves. Instead, the mechanism relies on the pervasive existence of Alfven waves in the interplanetary medium. Resulting from electron interaction with enhanced Alfven waves, the wave-particle resonance condition is modified, leading to direct amplification of radiation without recourse to Langmuir waves or nonlinear processes. Specifically, he (1) conducts a systematic survey of physical parameters and determines the instability characteristic as a function of these parameters; (2) extends the stability analysis to electrostatic Langmuir and ion-acoustic waves; (3) generalizes his analysis to an obliquely propagating electromagnetic wave; (4) fully relativistically generalizes the theory; and (5) obtains information on the saturated wave amplitude.

研究人员继续研究另一种不涉及朗缪尔波的无线电发射理论。相反，这种机制依赖于星际介质中普遍存在的阿尔芬波。由于电子与增强的Alfven波相互作用，波粒共振条件被修改，导致辐射的直接放大而不依赖于Langmuir波或非线性过程。具体而言，他(1)对物理参数进行了系统的调查，并确定了不稳定性特征作为这些参数的函数；(2)将稳定性分析扩展到静电朗缪尔和离子声波；(3)将他的分析推广到一个斜传播的电磁波；(4)完全相对论地推广理论；(5)得到饱和波幅值信息。