Near-Simultaneous Observations from Multiple DMSP Satellites: A New Direction in Probing the Magnetosphere

多颗 DMSP 卫星近乎同步观测：探测磁层的新方向

• 批准号: 0344690
• 负责人: Ching-I Meng
• 金额: $ 24万
• 依托单位: Johns Hopkins University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-02-15 至 2007-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0344690&HistoricalAwards=false
• 关键词: Near; Simultaneous; Observations; Multiple; DMSP

This project will utilize near simultaneous passes of two (or more) satellites from the Defense Meteorological Satellite Program (DMSP) to investigate (1) the spatial and temporal structure of large scale electron acceleration (LSEA) events (also referred to as "inverted-V events" and (2) the phenomenon known as a "double cusp." Fortuitous conjunctions of the DMSP satellites occasionally bring the satellites within 50 km of one another in the auroral zone. The particle precipitation measurements from the satellites can be used to identify LSEA events and the differences observed between the satellites can be used to study the evolution of the LSEA event. Statistical analysis of many such events will make it possible to separate spatial structure from temporal evolution.Instances of multiple DMSP passes through the dayside auroral oval will be used to compare the particle precipitation characteristics on opposite sides of noon. High latitude magnetic merging takes place on the opposite sides of noon in the northern and southern hemisphere when the interplanetary magnetic field is dominated by the east-west component. It has been suggested that the particle precipitation features originating from opposite hemispheres should have particular signatures. This project will determine what those particular signatures are and will elucidate the nature of the double cusp.

该项目将利用国防气象卫星计划（DMSP）的两颗（或更多）卫星几乎同时通过来研究（1）大尺度电子加速（LSEA）事件（也称为“倒V事件”）的空间和时间结构以及（2）称为“双尖点”的现象。“DMSP卫星的偶然会合偶尔会使卫星在极光区彼此相距不到50公里。 来自卫星的粒子降水测量可用于识别LSEA事件，并且卫星之间观察到的差异可用于研究LSEA事件的演变。 对许多这样的事件的统计分析将使空间结构与时间演变分离成为可能。多个DMSP通过昼侧极光椭圆的时间间隔将被用来比较中午两侧的粒子降水特征。 当行星际磁场由东西向分量主导时，高纬磁合并发生在正午前后的北方和南半球。 有人认为，来自相对半球的粒子沉淀特征应该具有特定的特征。 这个项目将确定这些特殊的签名是什么，并将阐明双尖的性质。