CEDAR: Advanced Modular Incoherent Scatter Radar (AMISR) and Imaging Radar Studies of the Auroral Electrojet

这是一个实验和理论研究的等离子体不规则性的极光电喷流，它们对背景环境的影响，以及它们的潜在效用监测精细结构的极光对流模式的遥感。调查还试图量化的对流模式在安静和干扰期间的时空变化。这种可变性有助于焦耳加热，并且沿着波加热，是磁层-电离层耦合的一个重要但被忽视的方面。研究人员将调查以下问题：当代理论是否充分考虑了波加热由于法利布尼曼不稳定性？1型雷达回波的多普勒频移如何依赖于电子和离子温度？第1型和第2型极光回波的多普勒频移如何依赖于对流速度？极光回波的光谱宽度取决于什么？中性风有哪些影响？对流电场的变化对焦耳加热率的影响有多大？这项研究将利用费尔班克斯附近的AMISR非相干散射雷达和安克雷奇的相干散射雷达成像仪的共同体积观测。它们一起形成了一个强大的诊断工具，用于研究极光E区等离子体波和波的影响，具有最小的模糊性。更广泛的影响，研究将在实验工具和代码的形式，将开发AMISR和提供给大气层物理界，雷达成像技术的开发和验证，适用于直接感兴趣的领域之外，以及教育和培训研究生和本科生在无线电科学和工程。此外，这项工作将扩大安克雷奇的实验场地，这是一个理想的研究和培训场所，因为它靠近AMISR和扑克平地。

This is an experimental and theoretical investigation of plasma irregularities in the auroral electrojet, their effect on the background environment, and their potential utility for monitoring fine structure in the auroral convection pattern by remote sensing. The investigation also seeks to quantify space-time variability in the convection pattern during quite and disturbed periods. This variability contributes to Joule heating and is, along with wave heating, a significant but neglected aspect of magnetospheric-ionospheric coupling. The investigators will investigate the following questions: Does contemporary theory fully account for wave heating due to Farley Buneman instabilities? How does the Doppler shift of type 1 radar echoes depend on electron and ion temperature? How do the Doppler shifts of type 1 and 2 auroral echoes depend on the convection velocity? On what do the spectral widths of auroral echoes depend? What are the effects of neutral winds? How much can variability in the convection electric field contribute to the Joule heating rate? The study will make use of common volume observations from the AMISR incoherent scatter radar near Fairbanks and a coherent scatter radar imager in Anchorage. Together, they form a powerful diagnostic tool for studying auroral E region plasma waves and wave effects with minimal ambiguity. The broader impact the research will come in the form of the experimental tools and codes that will be developed for AMISR and made available to the aeronomy community, the development and validation of radar imaging techniques which are applicable outside the immediate field of interest, and the education and training of graduate and undergraduate students in radio science and engineering. Furthermore, the work will expand the experimental site in Anchorage which is an ideal research and training venue, given its proximity to the AMISR and the Poker Flat Range.