SGER: Advanced Modular Incoherent Scatter Radar (AMISR) Studies at High-Frequency Active Auroral Research Program (HAARP)

SGER：高频主动极光研究计划 (HAARP) 的高级模块化非相干散射雷达 (AMISR) 研究

• 批准号: 0528111
• 负责人: Frank Djuth
• 金额: $ 5.09万
• 依托单位: Geospace Research Inc
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-05-01 至 2006-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0528111&HistoricalAwards=false
• 关键词: SGER; Advanced; Modular; Incoherent; Scatter

The investigator will conduct geophysical tests of the Advanced Modular Incoherent Scatter Radar (AMISR), which is currently under development for future deployment in Alaska and Canada. An 8-panel radar production prototype was delivered to the High-Frequency (HF) Active Auroral Research Program (HAARP) facility in January 2005. This is a small sub-unit of the actual radar. The HAARP facility will generate a strong geophysical target (the so-called HF enhanced plasma line) that can be used to test radar reception at frequency offsets from the transmission frequency (nominally 446 MHz). There are several fundamental questions related to radio wave modification of the high-latitude ionosphere that may be answered by the AMISR observations. These include: 1) why is airglow preferentially generated by the HF beam when it is directed parallel to geomagnetic field lines? 2) why are there pronounced overshoots in HF-induced airglow emissions at 630.0 nm? 3) can strong turbulence be detected within the HF standing wave pattern during vertical transmissions at HAARP? and 4) do the enhanced electron temperatures generated when the HF beam is directed parallel to the geomagnetic field give rise to stronger enhanced plasma lines because of reductions in ion Landau damping? The former two questions must be answered under new moon conditions in February/March/April, whereas the latter two questions are best answered under summertime conditions. AMISR is a state of- the-art system with wide-ranging capabilities (e.g., rapid beam scanning, remote operation, and a reconfigurable antenna architecture). This test program will introduce several new HF-modification observing techniques to students and postdoctoral fellows and entails instruction and training of personnel in the interaction of a high-power radio wave with the ionospheric plasma. The wave-plasma physics to be studied scales directly into the dimensional regime of laser plasmas. The great advantage of ionospheric modification experiments is the laboratory-without-walls environment of space, which avoids artifacts caused by particle interactions with laboratory chamber walls. Activities of this nature broaden the education of individuals focused on studies of the natural ionosphere and/or upper atmosphere. Moreover, the test experiments will provide cross-disciplinary training for students studying basic plasma physics. The results of this program will be disseminated through publications in professional journals, public presentations, and other non-refereed publications.

调查员将对先进的模块化非相干散射雷达进行地球物理测试，该雷达目前正在开发中，将来将部署在阿拉斯加和加拿大。一个8面板雷达生产样机于2005年1月交付给高频有源极光研究计划(HAARP)设施。这是实际雷达的一个小单元。HAARP设施将产生一个强大的地球物理目标(所谓的高频增强型等离子体线)，可用于测试雷达在偏离发射频率(名义上为446兆赫)的频率处的接收情况。阿米西里研究所的观测结果可能会回答与高纬度电离层的无线电波修正有关的几个基本问题。这些问题包括：1)当高频束平行于地磁线时，为什么它优先产生气辉？2)为什么在630.0 nm处高频诱导的气辉发射有明显的超调？3)在HAARP垂直传输期间，能否在高频驻波图案内检测到强烈的湍流？以及4)当高频束平行于地磁场时产生的电子温度增强是否由于离子朗道衰减的减少而导致更强的增强等离子体谱线？前两个问题必须在2/3/4月的新月条件下回答，而后两个问题在夏季条件下回答得最好。AMICISR是一种最先进的系统，具有广泛的功能(例如，快速波束扫描、远程操作和可重新配置的天线架构)。这项测试计划将向学生和博士后介绍几种新的高频修正观测技术，并要求对人员进行高功率无线电波与电离层等离子体相互作用的指导和培训。要研究的波-等离子体物理直接进入激光等离子体的维度区域。电离层改装实验的最大优势是空间的实验室无墙环境，避免了粒子与实验室室壁相互作用造成的伪影。这种性质的活动扩大了以研究自然电离层和/或高层大气为重点的个人的教育。此外，测试实验将为学习基础等离子体物理的学生提供跨学科培训。该计划的结果将通过专业期刊、公开演讲和其他非推荐性出版物的出版物进行传播。