CEDAR: Coupling of the High-Latitude F-Region to Topside Upflows

CEDAR：高纬度 F 区域与上部上升流的耦合

• 批准号: 9612573
• 负责人: James Horwitz
• 金额: $ 13.5万
• 依托单位: University of Alabama in Huntsville
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-01-01 至 2000-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9612573&HistoricalAwards=false
• 关键词: CEDAR; Coupling; Latitude; Region; Topside

This project will determine quantitative properties and causes of high-latitude F-region and topside ionospheric zone upflows. The PI will systematically examine the effects of at le4ast three candidate magnetospheric 'drivers' for such upflows: (1) effects of soft electron precipitation; (2) downward magnetospheric heat fluxes; and (3) convection-driven frictional ion heating. His methods used will be: (1) ionospheric fluid studies, (2) analysis of 200-800 km profiles of ionospheric plasma density, temperature and field aligned flow velocity measurements, and (3) analysis of DE-2 measurements of ionospheric and magnetospheric particles and fields. Preliminary investigations the PI has performed have produced two model-data comparison papers, which indicate in quantitative detail the importance of the soft electron precipitation effects as well as the magnetospheric electron heat fluxes. In addition, ion upfluxes significantly correlate with electron and temperatures, and ion field-aligned velocities have a direct relationship with the computed ambipolar electric field. Finally, substantial upflows occur only for soft electron precipitation average energies less than 100 eV. Further studies will be of widespread interest to CEDAR and the general ionospheric community.

该项目将确定高纬度F区和顶侧电离层区上升流的数量特性和原因。 PI将系统地研究至少三个候选磁层“驱动器”对这种上升流的影响：（1）软电子沉淀的影响;（2）向下的磁层热通量;（3）对流驱动的摩擦离子加热。 他使用的方法将是：（1）电离层流体研究;（2）分析电离层等离子体密度、温度和场对准流速测量的200-800公里剖面;（3）分析电离层和磁层粒子和场的DE-2测量。 PI进行的初步调查已经产生了两个模型数据比较文件，定量详细说明了软电子沉淀效应以及磁层电子热通量的重要性。 此外，离子上通量显着相关的电子和温度，离子场对齐的速度有直接的关系与计算的双极电场。 最后，只有软电子沉淀平均能量小于100 eV时才会出现大量的上升流。 进一步的研究将引起CEDAR和一般电离层界的广泛兴趣。