CEDAR: Sprites as a Manifestation of Intense Electrodynamic Coupling of the Lower Atmosphere with the Ionosphere

CEDAR：精灵作为低层大气与电离层强烈电动力耦合的表现

• 批准号: 9908766
• 负责人: Umran Inan
• 金额: $ 24万
• 依托单位: Stanford University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-03-15 至 2004-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9908766&HistoricalAwards=false
• 关键词: CEDAR; Sprites; Manifestation; Intense; Electrodynamic

ATM-9908766Inan, UmranA three year effort is proposed to theoretically investigate the energetics and potential global effects of the breakdown ionization regions associated with spectacular luminous glows occurring in clear air above thunderstorms (sprites).The purpose of the proposed research is to determine the temporal dynamics of energy transfer from lightning generated quasi-electrostatic fields into rotational, vibrational, electronic, and chemical energy of atmospheric molecules, resulting in optical (ultraviolet to infrared) emission, and to estimate the consequences of this deposited energy on the thermal and chemical balance of the D-region on a global scale. Recent experimental and theoretical findings indicate that the further development of understanding of energetics and phenomenology of sprite phenomena requires the inclusion of non-local and non-stationary effects of energetics runaway electrons on the dynamics and optical properties of the electrical breakdown above thunderstorms. The PIs will develop a comprehensive two-dimensional Monte Carlo particle model to treat effects of suprathermal runaway electrons on the development of the electrical breakdown in different altitude ranges. To answer outstanding scientific questions and to compare the model results with sprite observations the PIs will link their sprite models with available state-of-the-art D region chemistry, radiative transfer and infrared radiation models.

提出了一项为期三年的努力，从理论上研究与雷暴（精灵）上方晴空中发生的壮观发光有关的击穿电离区域的能量学和潜在的全球影响。本研究的目的是确定闪电产生的准静电场的能量转化为大气分子的旋转、振动、电子和化学能的时间动力学，从而产生光学（紫外到红外）发射，并估计这种沉积能量对全球范围内d区热和化学平衡的影响。最近的实验和理论发现表明，进一步发展对闪电现象的能量学和现象学的理解需要包括能量逃逸电子对雷暴以上电击穿的动力学和光学性质的非局域和非稳态效应。pi将建立一个全面的二维蒙特卡罗粒子模型来处理超热失控电子对不同高度范围电击穿发展的影响。为了回答突出的科学问题，并将模型结果与精灵观测结果进行比较，pi将把他们的精灵模型与现有的最先进的D区化学、辐射传输和红外辐射模型联系起来。