FESD Type-1: Electrical Connections and Consequences Within the Earth System

FESD 类型 1：地球系统内的电气连接和后果

• 批准号: 1135446
• 负责人: Jeffrey Forbes
• 金额: $ 450万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-10-01 至 2018-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1135446&HistoricalAwards=false
• 关键词: FESD; Type; Electrical; Connections; Consequences

Millions of lightning flashes occur per day over the Earth, transferring tremendous power from electrical clouds to Earth's surface in the form of electric current. Lightning discharges also occur between the clouds and the edge of space, producing luminous displays called sprites and elves. These events can occur because cosmic rays from other galaxies and x-rays from the Sun make the edge of space electrically-conducting. It is not well understood how lightning might modify ionospheric conditions that affect communications and navigation (e.g., GPS) systems, or how changes in the space environment might affect electrical processes in polar-region clouds relevant to weather and climate, or how society would be impacted in other ways through electrical connections within the Earth-atmosphere-geospace system. This Broad topic is the subject of the project "Electrical Connections and Consequences Within the Earth System".It is the purpose of this 5-year multi-institutional basic research investigation to better understand the electrical processes that link together the atmosphere, solid earth and geospace components of the Earth system. The approach is to develop improved understanding of processes controlling the charge and discharge of electrified clouds, the electrical coupling between the atmosphere and ionosphere, and the flow of current throughout the system. The project will culminate in creation of a global model that is capable of replicating much of the experimental data accumulated to date, and that Interfaces with the rest of the atmosphere-ionosphere system within the Whole Atmosphere Community Climate Model (WACCM) at the National Center for Atmospheric Research (NCAR). Other key goals of this project are to educate the public about this field of study, and to motivate and educate a cadre of next-generation scientists on this global view of the Earth-atmosphere-geospace system.

地球上空每天发生数百万次闪电，将巨大的能量以电流的形式从电云传输到地球表面。闪电放电也发生在云层和太空边缘之间，产生称为精灵和精灵的发光显示。这些事件的发生是因为来自其他星系的宇宙射线和来自太阳的X射线使空间边缘导电。目前还不清楚闪电如何改变影响通信和导航的电离层条件（例如，全球定位系统（GPS）系统，或空间环境的变化如何可能影响极地地区云层中与天气和气候有关的电过程，或社会如何通过地球-大气-地球空间系统内的电连接以其他方式受到影响。这个广泛的主题是“地球系统内的电气连接和后果”项目的主题。这是一个为期5年的多机构基础研究调查的目的，以更好地了解连接地球系统的大气，固体地球和地球空间组成部分的电气过程。该方法是加深对控制带电云充电和放电的过程、大气层和电离层之间的电耦合以及整个系统的电流流动的理解。该项目最终将创建一个全球模型，该模型能够复制迄今为止积累的大部分实验数据，并与国家大气研究中心（NCAR）的全大气社区气候模型（WACCM）中的大气-电离层系统的其余部分相连接。该项目的其他主要目标是教育公众了解这一研究领域，并激励和教育下一代科学家干部了解地球-大气-地球空间系统的全球观点。