Collaborative Research: Impacts of Ion-Neutral Coupling on Ion Upflow and Outflow in the Polar Cusp

合作研究：离子中性耦合对极尖点离子上流和流出的影响

• 批准号: 1522133
• 负责人: Roger Varney
• 金额: $ 23.96万
• 依托单位: SRI International
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-07-01 至 2020-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1522133&HistoricalAwards=false
• 关键词: Collaborative; Research; Impacts; Ion; Neutral

Numerical modeling is one of the popular tools of modern space and atmospheric sciences. Computer simulations and numerical experiments allow the investigation various processes in the Earth environment and predict outcomes of these processes. Comparison with actual observational data allows the tuning of numerical models and improving this scientific tool. Many noted institutions are working on creating and constantly improving these models allowing scientists to utilize them for their research. Thus, the objective of the research will allow better understanding of the solar wind - magnetosphere interaction and improving global-scale coupled geospace models. This recommended collaborative effort is to investigate the dynamics and features of the interaction between ions and neutral atoms of the ionosphere and thermosphere during geomagnetic storms. The research focuses on how this interaction affects the upflow and outflow of ions. This investigation will consist of a series of numerical experiments applying global-scale geospace numerical models. Coupled Magnetosphere Ionosphere Thermosphere model (CMIT) will be used in combination with Ionosphere / Polar Wind Model (IPWM) to analyze how thermospheric changes can affect the ion upflow and outflow simulated in the IPWM. CMIT model is a combination of the Lyon-Fedder-Mobarry (LFM) Magnetospheric MHD model, the Magnetosphere Ionosphere Exchange (MIX) model of high-latitude electrodynamics, and the Thermosphere Ionosphere Electrodynamics General Circulation Model (TIEGCM). The research also concentrates on studying how the solar wind features and dynamics affect the ion-neutral interaction in the cusp and cleft and on finding specific distinctive signatures of this coupling, which could be recognized by ground-based instruments, for example, incoherent scatter radars at high latitudes.

数值模拟是现代空间与大气科学的常用工具之一。计算机模拟和数值实验允许研究地球环境中的各种过程并预测这些过程的结果。与实际观测数据的比较可以调整数值模式并改进这一科学工具。许多著名的机构正在努力创建和不断改进这些模型，使科学家能够利用它们进行研究。因此，该研究的目的将有助于更好地理解太阳风-磁层的相互作用，并改进全球尺度的耦合地球空间模型。这项建议的合作努力是研究电离层和热层中离子和中性原子在地磁风暴期间相互作用的动力学和特征。研究的重点是这种相互作用如何影响离子的向上流动和流出。这项研究将包括一系列应用全球尺度地球空间数值模型的数值实验。耦合磁层-电离层-热层模式（CMIT）将与电离层/极风模式（IPWM）相结合，分析热层变化对IPWM模拟的离子上行和流出的影响。CMIT模式是lyon - feder - mobarry （LFM）磁层MHD模式、高纬度电动力学磁层电离层交换（MIX）模式和热层电离层电动力学环流模式（TIEGCM）的组合。研究还集中于研究太阳风的特征和动力学如何影响尖峰和裂缝中的离子中性相互作用，并寻找这种耦合的特定特征，这些特征可以被地面仪器识别，例如高纬度地区的非相干散射雷达。