CEDAR: Evaluating Dayside Auroral Hydrogen Emission as an Aeronomic Signature of Magnetospheric Processes

研究人员将建立日侧氢排放与磁层边界等离子体重联点之间的时空关系。该技术是在位于日侧极光下方的观测站从三个方向观测日侧极光氢的多普勒光谱剖面。在斯瓦尔巴群岛朗伊尔城的白天极光下，将三个大口径光谱仪对准不同方向，同时测量重联事件电离层脚点附近的氢发射光谱剖面，以实现这一目标。从这些光谱和其他辅助光学数据中，研究人员将推断出日侧磁层顶重联事件的位置和范围，以及对流的方向。如果这种方法被证明是成功的，那么从地面或太空进行的一系列氢发射观测就可以得出总重联率的测量结果，并绘制出日侧磁层顶重联过程的图像。

The investigators will establish the spatial and temporal relationship between dayside hydrogen emissions and plasma reconnection sites at the magnetospheric boundary. The technique is to observe the Doppler spectral profile of dayside auroral hydrogen in three directions from a station situated under the dayside aurora. The objective will be accomplished by aiming three large-aperture spectrometers in different directions under the dayside aurora at Longyearbyen, Svalbard, to measure the hydrogen emission spectral profile simultaneously near the ionospheric foot point of reconnection events. From these spectra, and other supporting optical data, the investigtors will deduce the location and the extent of the reconnection event on the dayside magnetopause, and the direction of convection. If this method proves to be successful, an extended array of hydrogen emission observations from the ground or from space could produce a measure of the total reconnection rate and a picture of the reconnection process at the dayside magnetopause.