Laboratory Investigation of Stationary Inertial Alfven Waves on the Large Plasma Device-Upgrade at UCLA

加州大学洛杉矶分校大型等离子体装置升级中的稳态惯性阿尔文波实验室研究

• 批准号: 1301896
• 负责人: Mark Koepke
• 金额: $ 25.5万
• 依托单位: West Virginia University Research Corporation
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-08-15 至 2016-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1301896&HistoricalAwards=false
• 关键词: Laboratory; Investigation; Stationary; Inertial; Alfven

A stationary inertial Alfvén wave (StAIW) is a nonfluctuating, nontravelling, spatially periodic pattern in the electromagnetic field and fluid quantities, predicted analytically and now being documented in the lab, that explains with a model certain observed morphology and dynamics of long-lived auroral arcs, the source mechanism causing these features, and the evolution from the background state of the magnetosphere for cases of arc duration longer than 10 seconds. A lab experiment will be performed to validate the space-relevant predictions of the StIAW model. The StIA-wave parallel dc electric field accelerates electrons along magnetic field (z direction) to speeds in excess of the Alfvén speed and the ultimate electron velocity gain parallel to the magnetic field will be measured in the lab at various z positions, with a double-sided Mach probe, and compared to a model. Lab documentation of the existence of the StIAW dc parallel electric field in spite of the rapid charge-imbalance compensation ability of electrons along magnetic field lines would be a significant milestone in the space physics field because source, dynamics, and morphology, all three, of stable, long-lived auroral arcs would be explained in a single model. The planned research will support student mentoring having an international perspective at WVU and UCLA. The planned research strengthens the interrelationship between plasma experiments in the lab and in space that is aimed at targeted validation of geoscience phenomena. Space plasma dynamics, instability, and particle energization represent the broader application of the proposed basic plasma research. The planned research contributes to international cooperation through scientific collaboration within the realm of university research.

静止惯性阿尔文波（StAIW）是电磁场和流体量中的一种非波动、非传播、空间周期性模式，通过分析预测，现在正在实验室中记录，它用模型解释了某些观察到的长寿命极光弧的形态和动力学，以及导致这些特征的源机制，以及电弧持续时间超过10秒的情况下从磁层背景状态的演变。将进行实验室实验，以验证StIAW模型的空间相关预测。StIA波平行直流电场使电子沿沿着磁场（z方向）加速到超过阿尔文速度的速度，并将在实验室中使用双面马赫探针在不同z位置测量平行于磁场的最终电子速度增益，并与模型进行比较。尽管电子沿着磁场线具有快速电荷不平衡补偿能力，但StIAW直流平行电场的存在的实验室文件将是空间物理领域的一个重要里程碑，因为稳定，长寿的极光弧的来源，动力学和形态，所有这三个都将在一个单一的模型中得到解释。 计划中的研究将支持在西弗吉尼亚大学和加州大学洛杉矶分校具有国际视野的学生指导。计划中的研究加强了实验室和空间等离子体实验之间的相互关系，目的是有针对性地验证地球科学现象。空间等离子体动力学、不稳定性和粒子扩散是等离子体基础研究的更广泛应用。 计划中的研究通过大学研究领域内的科学合作促进国际合作。