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CEDAR Post-Doc: The Electron Energy Balance over Millstone Hill Using Combined Optical and Incoherent Scatter Measurements

CEDAR 博士后：使用光学和非相干散射测量相结合的磨石山上的电子能量平衡

基本信息

批准号：
9612817
负责人：
Philip Richards
金额：
$ 9万
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 1998-12-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9612817&HistoricalAwards=false
关键词：
CEDAR Post Doc Electron Energy

项目摘要

This post-doctoral grant examines the thermal balance of ionospheric electrons through combining optical and incoherent scatter measurements. He will accomplish measurements with ground-based observations that utilize CEDAR developed instrumentation at Millstone Hill Observatory. Optical measurements supplement the ongoing CEDAR NETE campaign, and are designed to provide conjugate hemisphere photoelectron flux information. This flux of photoelectrons is the heat source for thermal electrons in the nighttime ionosphere. Hence, optical measurements of the conjugate hemisphere photoelectron flux will provide an important constraint for the radar investigation of ionospheric behavior. In addition, he will perform a modeling study of mechanisms responsible for enhanced nighttime electron temperature and densities over Millstone Hill. The Field Line Interhemispheric Plasma (FLIP) model calculates plasma density and temperature above 80 km from one hemisphere to another. One aspect of the modeling to be addressed is plasmaspheric heating through pitch angle trapping of ionospheric electrons, which is estimated by assuming a fraction of the photoelectrons trapped in the plasmasphere depositing a whole of their energy there. Ongoing radar measurements coupled with the proposed ground-based optical measurements of photoelectron flux will constrain this estimate of the fraction of photoelectrons trapped in the plasmasphere.

这个博士后补助金通过结合光学和非相干散射测量来检查电离层电子的热平衡。他将完成测量与地面观测，利用CEDAR开发的仪器在磨石山天文台。光学测量补充了正在进行的CEDAR NETE活动，旨在提供共轭半球光电子通量信息。这种光电子流是夜间电离层中热电子的热源。因此，共轭半球光电子通量的光学测量将为电离层行为的雷达调查提供重要的约束。此外，他还将对Millstone Hill上空增强夜间电子温度和密度的机制进行建模研究。场线半球间等离子体（FLIP）模型计算从一个半球到另一个半球的80公里以上的等离子体密度和温度。要解决的建模的一个方面是通过电离层电子的俯仰角捕获的等离子体层加热，这是通过假设在等离子体层中捕获的光电子的一小部分在那里沉积它们的全部能量来估计的。正在进行的雷达测量加上拟议的地面光学测量的光电子通量将限制这种估计的分数被困在等离子体中的光电子。