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CEDAR: Characterizing the Polar Cap Topside Ionosphere

CEDAR：描述极冠上部电离层的特征

基本信息

批准号：
1452191
负责人：
Roger Varney
金额：
$ 35.9万
依托单位：
SRI International
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2015
资助国家：
美国
起止时间：
2015-07-15 至 2020-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1452191&HistoricalAwards=false
关键词：
CEDAR Characterizing Polar Cap Topside

项目摘要

This project addresses the polar cap topside ionosphere, a heretofore poorly characterized region of geospace, using novel experiments with the Resolute Bay Incoherent Scatter Radars (RISR-N and RISR-C) together with observations from the Enhanced Polar Outflow Probe (ePOP), observations from the three Swarm spacecraft, and numerical experiments using the Ionosphere/Polar Wind Model (IPWM). Although this project focuses on one region of geospace, it also relates to the connections between this region and other parts of the high-latitude geospace system. The polar cap topside ionosphere is a transition region with the magnetosphere through which ion upflows and outflows are transported. The polar cap is also a transition region between the dayside and the nightside, across which a significant amount of plasma is transported. A new pulse sequence will be developed for the incoherent scatter radars to enhance the sensitivity to the topside. The following specific questions will be addressed: (1) What are the typical properties of the polar cap topside ionosphere? (2) Which physical processes control the day-to-day, intraday, and patch-to-patch variability of the topside scale height and related quantities such as plasma temperature and ion upflow/downflow flux? (3) What do the polar cap topside observations imply about conditions upstream, e.g. in the cusp/cleft, and above in the polar wind?

这个项目利用决议湾非相干散射雷达(RISR-N和RISR-C)的新实验、增强型极地流出探测器(EPOP)的观测、三个Sum航天器的观测以及电离层/极风模型的数值实验，处理极冠顶部电离层，这是迄今为止描述得很差的一个地球空间区域。虽然该项目侧重于地球空间的一个区域，但它也涉及该区域与高纬度地球空间系统其他部分之间的联系。极帽顶部电离层是与磁层一起的过渡区，离子的上行和流出都通过磁层输送。极冠也是白昼和黑夜之间的过渡区域，大量的等离子体被输送到这里。针对非相干散射雷达，提出了一种新的脉冲序列，以提高雷达对顶面的灵敏度。以下具体问题将被讨论：(1)极冠顶部电离层的典型特性是什么？(2)哪些物理过程控制着顶部尺度高度和相关数量的逐日、日内和逐块变化，例如等离子体温度和离子上/下流动通量？(3)极冠顶部观测到的关于上游的条件，例如在极风的尖端/裂缝中，以及在更高的位置，意味着什么？