Collaborative Research: CEDAR--Assimilative Analysis of Low- and Mid-latitude Ionospheric Electrodynamics

合作研究：CEDAR--低纬度和中纬度电离层电动力学同化分析

• 批准号: 1651411
• 负责人: Astrid Maute
• 金额: $ 3.5万
• 依托单位: University Corporation For Atmospheric Res
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-08-01 至 2020-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1651411&HistoricalAwards=false
• 关键词: Collaborative; Research; CEDAR; Assimilative; Analysis

The phenomenology of the Earth's equatorial ionosphere with respect to vertical profiles of basic parameters such as the neutral wind and temperature as well as plasma density and ion/electron temperatures is complex. The root causes of the complexity lie in the mutually coupled dynamics of thermospheric winds, conductivity, electric fields and currents operating under the influence of the geomagnetic field. This region is also exposed to the continual varying conditions of both terrestrial weather and space weather, which taken together give rise to large day-to-day variability. The project's objective is to achieve the development of a comprehensive data assimilation approach tailored specifically to the problem of low-latitude electrodynamics that would close the gap in our understanding of the origins of longitudinal dependence and its day-to-day variability. The project would broaden the education and training experiences of a graduate student at University of Texas Dallas (UTD) and a postdoctoral researcher at University of Colorado Boulder (CU-Boulder) by their participation in this multi-faceted research approach. The UTD graduate student will spend a summer visiting CU-Boulder and NCAR for training in the use of numerical modeling and data assimilation tools. The investigation is highly relevant to the need of the modern society for more powerful and reliable communication, navigation and positioning systems. Specific science questions to be addressed in this project include 1) the quantitative breakdown of the causes of the observed day-to-day variability of daytime large scale equatorial phenomena along with its longitudinal and seasonal dependency; and 2) to what extent is the longitudinal dependence controlled by the geometry and magnitude of geomagnetic fields, and by the atmospheric tides originating from longitudinal asymmetric sources on the Earth's surface.

地球赤道电离层的现象学相对于基本参数（例如中性风和温度以及等离子体密度和离子/电子温度）的垂直剖面是复杂的。 复杂性的根本原因在于在地磁场影响下运行的热层风、电导率、电场和电流的相互耦合动力学。 该地区还面临着陆地天气和太空天气不断变化的条件，这些条件加在一起导致了巨大的日常变化。 该项目的目标是开发一种专门针对低纬度电动力学问题的综合数据同化方法，从而缩小我们对纵向依赖性起源及其日常变化的理解差距。 该项目将通过参与这种多方面的研究方法，拓宽德克萨斯大学达拉斯分校 (UTD) 的研究生和科罗拉多大学博尔德分校 (CU-Boulder) 的博士后研究员的教育和培训经验。 UTD 研究生将在一个夏天访问 CU-Boulder 和 NCAR，接受数值建模和数据同化工具使用的培训。 这项调查与现代社会对更强大、更可靠的通信、导航和定位系统的需求高度相关。该项目要解决的具体科学问题包括：1）对观测到的白天大规模赤道现象的日常变化及其纵向和季节依赖性的原因进行定量分析； 2）纵向依赖性在多大程度上受地磁场的几何形状和大小以及源自地球表面纵向不对称源的大气潮汐的控制。