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

研究人员将建立白天氢排放和磁层边界等离子体重联地点之间的空间和时间关系。这项技术是从位于日侧极光下的一个站点从三个方向观察日侧极光的多普勒谱轮廓。为了实现这一目标，将在斯瓦尔巴特群岛朗伊尔宾的日侧极光下对准不同方向的三个大口径光谱仪，以同时测量重联事件电离层脚点附近的氢发射光谱轮廓。根据这些光谱和其他辅助光学数据，研究人员将推断重联事件在日侧磁层顶上的位置和程度，以及对流的方向。如果这种方法被证明是成功的，从地面或从空间进行的氢发射观测的扩展阵列可以产生总重联速率的测量结果和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.