Collaborative Research: CEDAR: Flickering and Auroral Roar

这是美国空军学院（USAFA）和阿拉斯加大学费尔班克斯地球物理研究所（GI）的研究人员和学生之间的合作。该项目是一个为期2年的多仪器观测项目，目的是确定在极光中观测到的光学闪烁与极光轰鸣的无线电发射之间的关系。在有源离散电弧中，光闪烁是常见的现象。闪烁点是横向振动的光度柱，往往发生在极光弧的底部边缘。闪烁频率通常在2- 20hz之间，一个闪烁元素的寿命为几秒钟。极光轰鸣是在极光f区产生的一种波段有限的无线电发射，频率接近电子回旋频率的2到3倍。调制频带与闪烁的极光非常相似，即使还没有与闪烁的极光本身联系起来，这些类型的无线电发射也被命名为“闪烁的极光咆哮”。该项目将在阿拉斯加的卡克托维克进行联合光学和无线电观测，以解决两种类型的极光发射中闪烁之间的联系问题。在阿拉斯加北部海岸的卡克托维克，地球物理研究所有一个光学观测站，在那里经常可以观察到闪烁的极光。USAFA和GI开发的新型光学仪器将在卡克托维克部署和运行。此外，在美国国家科学基金会（NSF）的支持下，达特茅斯学院目前在那里运行一台数字中频干涉仪，并与该仪器的首席研究员（PI）合作，为本研究提供所需的无线电观测。该项目还将利用一些已经计划好的火箭发射，从卡克托维克上空的高层大气中提供现场测量。USAFA的本科生和GI的一名研究生将参与该项目。

This is collaboration between researchers and students at United States Air Force Academy (USAFA) and University of Alaska at Fairbanks' Geophysical Institute (GI). The project is a 2-year multi-instrument observational program to determine the relationship between optical flickering observed in aurora and radio emissions from auroral roars. Optical flickering is common in active discrete arcs. The flickering spots are laterally vibrating columns of luminosity which tend to occur on the bottom edges of auroral arcs. The flicker frequency is typically between 2-20 Hz, with a lifetime of one flickering element of a few seconds. Auroral roar is a band limited radio emission generated in the auroral F-region at frequencies near 2 and 3 times the electron cyclotron frequency. The modulation frequency band is very similar to that of flickering aurora, and even though no connection has yet been made with flickering aurora itself, these types of radio emissions have been named "flickering auroral roar". This project will conduct joint optical and radio observations at Kaktovik Alaska to address the question of the link between flickering in the two types of auroral emissions. At Kaktovik, on the north coast of Alaska, the Geophysical Institute has an optical observatory where flickering aurora is commonly observed. New optical instruments developed at both USAFA and GI will be deployed and operated at Kaktovik. In addition, Dartmouth College currently operates a digital Medium Frequency Interferometer there with support from National Science Foundation (NSF) and collaboration with the principal investigator (PI) on this instrument has been established to provide the radio observations required for this study. The project also will take advantage of a number of already planned rocket launches that will provide in-situ measurements from the upper atmosphere over Kaktovik. Under-graduate cadets from USAFA as well as a graduate student from GI will participate in the project.