CEDAR: Sunlit Investigations of Soft Arcs and the Cusp Boundary with Coordinated ISR and HiRISE Diagnostics

研究人员将通过探测白天高纬度电离层中的电子密度、电子温度和氧发射结构来研究磁鞘-电离层相互作用。对尖点边界和日侧极光弧进行长期的地面研究，通过测量尖点对太阳风强迫的形态响应，并通过检查尖点边界与软弧的位置和运动的关系，可以极大地促进我们对磁合并的理解。这项研究还将为研究日侧极光弧的能量学提供机会。通过将等离子体密度和630纳米发射的测量与太阳紫外线光化学模型相结合，研究人员将把对日光极光的研究扩展到迄今为止用传统雷达和光学工具无法探测到的低能量区域。这项研究将有助于理解尖点的形态如何响应太阳强迫，日光弧线和尖点边界之间的关系，以及日边弧线的运动是如何受行星际磁场控制的。观测将使用位于格陵兰岛松德斯特罗姆的光谱仪和非相干散射雷达进行。将提供白天极光测量的网络实时档案，该档案链接到Sondrestrom全天成像仪现有的夜间图像储存库，作为未来合作者的资源。这一网络档案还将包含一个描述性说明和指向面向公众的卫星图像的链接，以提高人们对极光发射这一全天候现象的认识。

The investigators will study magnetosheath-ionosphere interaction by probing electron density, electron temperature and oxygen emission structures in the dayside high-latitude ionosphere. Long-term, ground-based studies of the cusp boundary and dayside auroral arcs can greatly advance our understanding of magnetic merging by measuring the morphological response of the cusp to solar wind forcing, and by examining the relationship of the cusp boundary to the location and motion of soft arcs. This study will also provide an opportunity to study the energetics of dayside auroral arcs. By merging measurements of plasma density and 630 nm emissions with a solar ultraviolet photochemical model, the investigators will extend studies of daylit aurora to a low energy regime heretofore undetectable with conventional radar and optical tools. This study will help to understand how the morphology of the cusp responds to solar forcing, the relationship between daylit arcs and the cusp boundary, and the way in which the motion of dayside arcs is controlled by the interplanetary magnetic field. The observations will be made with a spectrograph and an incoherent scatter radar located at Sondrestrom, Greenland. A web-based real-time archive of daytime auroral measurements, linked to the existing repository of nightside images from the Sondrestrom all-sky imager, will be provided as a resource for future collaborators. This web archive will also contain a descriptive narrative and links to satellite images aimed at the general public, so as to increase awareness of auroral light emission as a round-the-clock phenomena.