CEDAR: AMISR Measurements of Auroral Disturbance Electrodynamics, Including Relations to Harang Reversal and Large-Scale Convection Evolution

利用先进的模块化非相干散射雷达(AMICR)在阿拉斯加扑克平板火箭靶场以高时间分辨率研究了极光扰动的二维电离层电动力学。与夜间电场逆转(称为Harang不连续面)和极冠对流强度的时间演变有关的电动力学是具体的观测目标，主要研究目标是了解支配大规模等离子体片传输的物理以及这种传输与电离层的电动力学耦合。磁亚风暴开始、亚暴生长阶段极光弧、动态气压扰动和极光向极光边界强化--所有这些都与等离子体片对流耦合--被包括为感兴趣的观测目标，建立了其形成、演化和衰变的电动力学，并与当前的亚暴理论进行了比较。此外，还对比了由Alfvenic波电子加速引起的极光与由静电场定向势降引起的极光(倒V型极光)相关的电动力学。利用阿拉斯加光学成像仪和磁力计的数据，将阿米西里天文台的测量放在极光演化的更大区域范围内。极冠对流的强度和演化是通过阿米西里雷达、Sondrestromfjord非相干散射雷达和EISCAT Svalbard非相干散射雷达的同时测量确定的。

Two-dimensional ionospheric electrodynamics of auroral disturbances are studied with high time resolution using the Advanced Modular Incoherent Scatter Radar (AMISR) at the Poker Flat Rocket Range in Alaska. The electrodynamics associated with the nighttime electric field reversal (known as the Harang discontinuity) and with the temporal evolution of polar-cap convection strength are specific observation targets, and the primary research objective is to understand the physics governing large-scale plasma sheet transport and the electrodynamic coupling of that transport to the ionosphere. Magnetic substorm onsets, substorm growth phase auroral arcs, dynamic pressure disturbances, and auroral poleward boundary intensifications - all of which couple to plasma sheet convection, are included as observational targets of interest for which the electrodynamics of formation, evolution, and decay are established and compared to current substorm theory. In addition, the electrodynamics associated with aurora caused by Alfvenic wave electron acceleration are contrasted with the aurora triggered by static field-aligned potential drops (Inverted-V aurora). The AMISR measurements are placed into a larger regional context of auroral evolution by use of data from optical imagers and magnetometers in Alaska. The strength and evolution of convection in the polar cap is determined using simultaneous measurements from AMISR, the Sondrestromfjord incoherent scatter radar, and the EISCAT Svalbard incoherent scatter radar.