Laboratory Experiments on Shear Alfven Waves and Shocks

剪切阿尔文波和冲击的实验室实验

• 批准号: 9703831
• 负责人: Walter Gekelman
• 金额: $ 26.5万
• 依托单位: University of California-Los Angeles
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-07-01 至 2000-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9703831&HistoricalAwards=false
• 关键词: Laboratory; Experiments; Shear; Alfven; Waves

The PIs will continue to experiment with Alfven waves and wave processes important to space plasma dynamics. They have developed a capability for launching and detecting shear Alfven waves in uniform plasmas and plasmas with controlled non-uniformities, allowing study under conditions analogous to those involved in electron and ion acceleration processes in the auroral ionosphere. The continuation will extend research in the role of Alfven waves in density striations and their contribution to plasma transport and ion heating. Complementing this study, the PI will investigate radiation of Alfven waves from narrow, modulated field aligned current channels. They will also investigate the properties of field-aligned resonances, and the behavior of Alfven wave cones in a magnetic beach. Finally, they will extend observations to the non-linear regime by investigating the propagation of a large amplitude magnetic pulse, using a pulsed slab magnetic field to generate shock waves and study their formation and propagation.

研究所将继续对阿尔芬波和对空间等离子体动力学很重要的波过程进行实验。 他们已经发展了在均匀等离子体和具有受控非均匀性的等离子体中发射和探测剪切阿尔芬波的能力，从而能够在类似于极光电离层中电子和离子加速过程的条件下进行研究。 继续将扩大阿尔芬波的作用，密度条纹和等离子体传输和离子加热的贡献的研究。 作为对这项研究的补充，PI将研究窄的调制场对准电流通道的阿尔芬波辐射。 他们还将研究场向共振的性质，以及阿尔芬波锥在磁性海滩中的行为。 最后，他们将通过研究大振幅磁脉冲的传播，使用脉冲板磁场产生冲击波并研究其形成和传播，将观测扩展到非线性区域。