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

ATM9813864调查人员将在格陵兰岛的Sondrestrom雷达周围建造和部署一套关键仪器。他们将在1999年冬季期间使用这些仪器进行一次单独的延长战役。这些仪器包括三个无线电信标接收器，它们将与格陵兰现有的两个接收器一起建造和部署，以便对E和F区域电离层进行无线电层析成像。在实验期间，格陵兰松德斯特罗姆的非相干散射雷达和法布里-珀罗涉仪将同时测量E区中性风。将使用计算机模型将本地测量放在全球范围内。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，并确定焦耳加热的小尺度变率的贡献及其对全球大气结构的影响。这项运动将测试和验证这些仪器，并表明可以用这种技术测量高分辨率焦耳加热。这些观测对雪松/定时科学目标很重要。Cedar是大气区域耦合、能量和动力学的缩写，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计划。Timed是NASA的一个卫星项目，用于研究热层、电离层、中间层能量学和动力学，以研究类似的大气区域。Cedar/Timed联合方案旨在协调地面和空间观测，以更好地了解较低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.