Study of Auroral Radio Emissions from Alaska: Continued Observations and Data Analysis

阿拉斯加极光无线电发射研究：持续观测和数据分析

• 批准号: 9123068
• 负责人: James LaBelle
• 金额: $ 3.93万
• 依托单位: Dartmouth College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-08-15 至 1994-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9123068&HistoricalAwards=false
• 关键词: Study; Auroral; Radio; Emissions; Alaska

Despite the intensity with which the aurora has been studied at radio wavelengths, there remains a gap in the ground measurements between a few hundred kiloHertz, the upper range of VLF experiments, and a few tens of megaHertz, at which riometers operate. A number of ground observations indicate that emissions are generated by the aurora in this frequency range, but the observations are spotty, and the nature and even the existence of these emissions remains uncertain. There is some theoretical work justifying the investigation of auroral emissions using ground- based instrumentation, but more systematic observations are needed to lay the groundwork for further theoretical progress. Under a previous NSF grant, a PC-based instrument for monitoring 0.1-5 MHz radio waves from remote sites has been developed and operated for one Winter, a preliminary analysis of the data has been done, and publications on this related subjects have been prepared or published. In the next year, we propose to continue collecting radio data from Alaska with an improved version of the instrument. We further propose three specific plans for completing the analysis of last year's data and the data from the upcoming year. The goals of the further year of study are: 1) to provide a solid start towards clearing up the uncertainty regarding the existence of and/or natures of LF/MF/HF emissions observable on the ground from aurorae; 2) to determine whether the method of using PC-based radio receivers in the Northern Hemisphere shows promise for longer-term observations of auroral emissions in the frequency range; and 3) to complete several specific data analysis goals which are achievable with data collected last year, and which will be enhanced by a further year of data.

尽管人们已经在无线电波长上研究了极光的强度，但在地面测量中，在几百赫兹（VLF实验的上限）和几十兆赫（riometer实验的上限）之间仍然存在差距。许多地面观测表明，在这个频率范围内，辐射是由极光产生的，但观测结果是不稳定的，这些辐射的性质甚至存在仍然不确定。有一些理论工作证明使用地面仪器研究极光发射是合理的，但需要更系统的观测来为进一步的理论进展奠定基础。在先前的国家科学基金会资助下，一个基于pc的仪器用于监测来自偏远地区的0.1-5兆赫无线电波，已经开发和运行了一个冬天，对数据进行了初步分析，并准备或出版了有关这一主题的出版物。明年，我们打算用改进后的仪器继续从阿拉斯加收集无线电数据。我们进一步提出三个具体方案，以完成对去年数据和明年数据的分析。下一年的研究目标是：1)提供一个坚实的开端，以消除地面上从极光观测到的低低频/中频/高频发射的存在和/或性质的不确定性；2)确定在北半球使用基于pc的无线电接收机的方法是否有望在频率范围内对极光发射进行长期观测；3)完成几个具体的数据分析目标，这些目标是通过去年收集的数据可以实现的，并且将通过下一年的数据来增强。