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

该项目将确定高纬度F区和电离层上层上升流的数量特性和成因。PI将系统地检查至少三个候选磁层“驱动因素”对这种上升的影响：(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。他将使用的方法是：(1)电离层流体研究，(2)分析200-800公里电离层等离子体密度、温度和场向流速测量的剖面，以及(3)分析电离层和磁层粒子和场的DE-2测量结果。PI进行的初步调查已经产生了两份模式数据比较文件，其中定量详细地指出了软电子沉淀效应以及磁层电子热通量的重要性。此外，离子上行流与电子和温度显著相关，离子的场向速度与计算的双极电场有直接关系。最后，只有当软电子沉淀的平均能量小于100 eV时，才会出现实质性的上升流。进一步的研究将引起Cedar和一般电离层社区的广泛兴趣。

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.