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

尽管极光的强度已经被研究， 无线电波长，地面测量仍然存在差距 在几百千赫兹之间，VLF的上限 实验，和几十兆赫，在riometers 手术。 一些地面观测表明， 是由极光在这个频率范围内产生的，但是 观察是参差不齐的，性质，甚至存在的 这些排放量仍然不确定。 有一些理论工作 证明使用地面- 基于仪器，但需要更系统的观察 为进一步的理论发展奠定基础。 下 先前的NSF拨款，基于PC的仪器，用于监测0.1-5 MHz 来自远程站点的无线电波已经被开发和操作， 一个冬天，对数据进行了初步分析， 已经编写了关于这一相关主题的出版物， 公开. 在未来一年，我们建议继续收集 来自阿拉斯加的无线电数据与改进版本的仪器。 我们进一步提出了三个具体的方案来完成分析 去年的数据和明年的数据。 的目标 1）提供一个坚实的开端 为了消除关于存在的不确定性， 和/或在地面上可观察到的LF/MF/HF发射的性质， 2）确定是否使用基于PC的无线电方法 北方的接收器显示出长期的希望 在频率范围内观测极光发射;以及3） 完成几个可以实现的具体数据分析目标 去年收集的数据，并将通过 年的数据。

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.