Collaborative Research: Applying the AGO Network to Energy Transfer in the Radiation Belts and Remote Sensing of Auroral Plasma Processes

合作研究：将AGO网络应用于辐射带能量传输和极光等离子体过程遥感

• 批准号: 1141817
• 负责人: James LaBelle
• 金额: $ 20万
• 依托单位: Dartmouth College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-07-01 至 2017-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1141817&HistoricalAwards=false
• 关键词: Collaborative; Research; Applying; AGO; Network

With this award, researchers at Dartmouth College and Stanford University will be addressing outstanding scientific questions regarding the energy transfer in the Earth's radiation belts and auroral plasma physics. Energetic plasma interacting with the geomagnetic field in the near-Earth space (geospace) environment emits electromagnetic waves across the radio spectrum, and ground-based measurements of these waves are used as diagnostic tools to investigate various processes in geospace. This investigation takes advantage of an existing network of radio receivers located in Antarctica from -70 to -85 degrees of invariant geomagnetic latitude and operating in the frequency range from extra low to high frequencies (ELF ~300 Hz to HF ~5 MHz). The Antarctic continent is ideally suited for these types of natural radio wave experiments since it is largely devoid of anthropogenic electromagnetic interference such as power line harmonics and radio frequency broadcast transmissions. The project will focus on studies of three geophysically important plasma waves. The first, chorus wave is believed to be a major driver of radiation belt electron acceleration and loss. The other two waves, auroral hiss and auroral kilometric radiation (AKR), are generated in the auroral acceleration region and have the potential to be used for remote sensing of this complex and poorly understood near-Earth region. The proposed studies are motivated by a recent, exciting detection of AKR on the Earth?s surface which was unexpected since the currently accepted theory for these waves generation predicts beaming of the radiation only outward away from Earth. This research also contributes to the training and education of both the young scientists and undergraduate students.

凭借这一奖项，达特茅斯学院和斯坦福大学的研究人员将致力于解决有关地球辐射带能量转移和极光等离子体物理学的突出科学问题。高能等离子体在近地空间（地球空间）环境中与地磁场相互作用，发射出跨越无线电频谱的电磁波，对这些波的地面测量被用作调查地球空间各种过程的诊断工具。这项调查利用了位于南极洲不变地磁纬度-70度至-85度之间的现有无线电接收器网络，其工作频率范围从极低频到高频（极低频~300赫兹至高频~5兆赫）。南极大陆非常适合这些类型的天然无线电波实验，因为它基本上没有人为电磁干扰，如电力线谐波和无线电频率广播传输。该项目将重点研究三种具有重要意义的等离子体波。第一，合唱波被认为是辐射带电子加速和损失的主要驱动力。另外两种波，极光嘶嘶声和极光公里辐射（AKR），产生于极光加速区，有可能用于遥感这一复杂和了解甚少的近地区域。拟议的研究的动机是最近，令人兴奋的检测AKR在地球上？这是出乎意料的，因为目前公认的理论，这些波的产生预测辐射只向外远离地球。本研究也有助于青年科学家和大学生的培养和教育。