SGER: Study of Plasma Transfer Across the Magnetopause

SGER：跨磁层顶的等离子体传输研究

• 批准号: 9206536
• 负责人: Walter Heikkila
• 金额: $ 5万
• 依托单位: University of Texas at Dallas
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-04-15 至 1994-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9206536&HistoricalAwards=false
• 关键词: SGER; Study; Plasma; Transfer; Across

The plasma physics of the magnetopause is the central problem of magnetospheric research and our proposed impulsive penetration process is truly innovative in the sense that it (i) provides solar wind plasma onto closed field lines in the boundary layer in sufficient quantities to drive magnetospheric and auroral processes, and (ii) changes the state of interconnection between interplanetary and geomagnetic field lines. We intend to proceed along three approaches in our research effort: (i) Particle simulation. We plan to cooperate with others on computer simulation, notably Dr. H. Okuda from Princeton University. He is doing state-of-the-art computer simulation of the physics of the magnetopause. (ii) A test particle approach. Starting from M. Gorton's model, perturbations of the magnetopause will allow us to calculate the inductive electric field and the magnetopause currents. (iii) Analysis of Experimental Data. Finally, we plan to take the September 6, 1981 event as a primary test case for the theory and modeling. On that unique occasion, DE-1 went outside the magnetopause during a period of very high magnetospheric compression while DE-2 traversed the foot of the field line on several orbits. Either a clear disconfirmation of the impulsive penetration process or a clear confirmation of it would be very important for advancing magnetopause physics.

磁层顶的等离子体物理是磁层研究的核心问题，我们提出的脉冲穿透过程在某种意义上是真正的创新，它(i)提供太阳风等离子体到边界层的封闭场线上，数量足够多，以驱动磁层和极光过程；（ii）改变行星际磁力线和地磁力线之间相互联系的状态。我们打算在我们的研究工作中沿着三种方法进行：(i)粒子模拟。我们计划在计算机模拟方面与其他人合作，特别是普林斯顿大学的H. Okuda博士。他正在用最先进的计算机模拟磁层顶的物理现象。（ii）测试粒子方法。从戈顿的模型出发，对磁层顶的扰动将使我们能够计算感应电场和磁层顶电流。（三）实验数据分析。最后，我们计划将1981年9月6日的事件作为理论和建模的主要测试案例。在那个独特的情况下，DE-1在磁层压缩非常高的时期走出了磁层顶，而DE-2在几个轨道上穿越了磁场线的底部。无论是对脉冲穿透过程的明确否定，还是对它的明确确认，都对推进磁层顶物理学非常重要。