Measurement of Mass-Loading Effects On Transport Processes in the Earth's Magnetosphere

地球磁层传输过程中质量载荷效应的测量

• 批准号: 0855924
• 负责人: Ennio Sanchez
• 金额: $ 37.5万
• 依托单位: SRI International
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-10-01 至 2013-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0855924&HistoricalAwards=false
• 关键词: Measurement; Mass; Loading; Effects; Transport

Variations in the mass density in the magnetosphere can have significant effects on a number of important magnetospheric phenomena. Mass loading is expected to effect the rate of magnetic reconnection and it effects the processes related to Ultra-Low Frequency (ULF) waves. Mass loading effects the growth rate and frequency of Kelvin-Helmholtz (K-H) oscillations at the magnetopause and in the low latitude boundary layer (LLBL). Although the effects are important, it has been difficult to get a quantitative measure of the mass loading and the associated effects. This project will develop a database of events for two classes of solar wind inputs. In each case, the event will begin with a prolonged period of northward interplanetary magnetic field (IMF), which will establish a "ground-state" of the magnetosphere. The first class of events that will be examined is Corotating Interaction Regions (CIRs) and the second class is periods of prolonged southward IMF. The mass loading effect on dayside magnetic merging will be examined by statistically comparing the rate of magnetic flux crossing the polar cap boundary as a function of the magnetospheric density. The project will use data from the Geotail and THEMIS satellite missions in conjunction with ground-based magnetometers and incoherent scatter radar data.The project will include research activities for a graduate student or advanced undergraduate student. The results will be of importance to the Geosapce Environment Modeling program as well as to our understanding and ability to forecast space weather events.

磁层中质量密度的变化会对许多重要的磁层现象产生重大影响。 预期质量负载会影响磁重新连接的速率，并影响与超低频率（ULF）波相关的过程。 质量负载影响磁磁性和低纬度边界层（LLBL）处的开尔文 - 螺旋（K-H）振荡的生长速率和频率。 尽管影响很重要，但很难对质量负荷和相关效应进行定量度量。 该项目将为两类太阳风输入开发事件数据库。 在每种情况下，该事件将从北向星际磁场（IMF）的长时间开始，该磁场将建立磁层的“基态”。将要检查的第一类事件是将相互作用区域（CIRS）旋转，第二类是延长南部IMF的时期。 通过统计学比较磁盖边界的磁通量速率，质量负载效果将检查与磁层密度的函数相结合的磁通量速率。 该项目将与地面卫星任务中的数据以及地面磁力计和不连贯的散点雷达数据一起使用。该项目将包括研究生或高级本科生的研究活动。 结果对于GeoSapce环境建模计划以及我们预测太空天气事件的能力至关重要。