CEDAR/TIMED: Joule-heating and Auroral Variability (JAVa) Campaign

调查人员将在格陵兰岛的Sondrestrom雷达周围建造并部署一套关键仪器。他们将在1999年冬季期间操作这些仪器进行一次长期活动。这些仪器包括三个无线电信标接收器，将与格陵兰岛的两个现有接收器一起建造和部署，以对E和F区电离层进行无线电层析成像。在实验过程中，格陵兰岛Sondrestrom的非相干散射雷达和Fabry-Perot干涉仪将同时测量E区中性风。当地的测量结果将通过计算机模型置于全球背景下。利用这种方法，研究人员将测量高度分辨焦耳加热的三维时空结构，确定焦耳加热中的小尺度变率的贡献及其对全球大气结构的影响。该活动将测试和验证这些仪器，并表明这种技术可以测量出高分辨率的焦耳加热。这些观测对CEDAR/TIMED的科学目标很重要。雪松，代表大气区域的耦合、能量学和动力学，是一个将理论建模与地面测量相结合来研究高层大气和电离层的全球变化项目。TIMED，即热层、电离层、中间层能量学和动力学，是美国宇航局研究大气类似区域的卫星项目。联合CEDAR/TIMED计划旨在协调地基和天基观测，以更好地了解低层热层和电离层的物理过程。

ATM9813864The investigators will build and deploy a set of critical instruments clustered around the Sondrestrom radar in Greenland. They will operate these instruments for a single extended campaign during the winter season in 1999. The instruments include three radio beacon receivers which will be built and deployed along with two existing receivers in Greenland to perform radio tomographic imaging of the E and F region ionosphere. During the experiment, simultaneous measurements of the E region neutral winds will be made by the incoherent scatter radar and a Fabry-Perot interferometer at Sondrestrom, Greenland. The local measurements will be put on a global context using computer models. Using this method, the investigators will measure the three dimensional spatial and temporal structure in the height-resolved Joule heating and determine the contribution of small scale variability in Joule heating and its impact on global atmospheric structure. The campaign will test and validate the instruments and show that high resolution Joule heating can be measured by this technique. The observations are important to CEDAR/TIMED science objectives. CEDAR, which stands for Coupling, Energetics, and Dynamics of Atmospheric Regions, is a global change program that combines theoretical modeling with ground-based measurements to study the upper atmosphere and ionosphere. TIMED, for Thermosphere, Ionosphere, Mesosphere Energetics and Dynamics, is a NASA satellite program to study similar regions of the atmosphere. The joint CEDAR/TIMED program aims to coordinate ground-based and space-based observations to achieve better understanding of physical processes in the lower thermosphere and ionosphere.