Collaborative Research: GEM: The Ionospheric Source of Magnetospheric Plasma-- Measuring, Modeling and Merging into the GEM Geospace General Circulation Model (GGCM)

合作研究：GEM：磁层等离子体的电离层源——测量、建模和合并到 GEM 地球空间环流模型 (GGCM)

• 批准号: 1203725
• 负责人: Robert Schunk
• 金额: $ 26.67万
• 依托单位: Utah State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-06-15 至 2016-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1203725&HistoricalAwards=false
• 关键词: Collaborative; Research; GEM; Ionospheric; Source

This project will combine observations of ionospheric ions throughout the magnetosphere-ionosphere system with the Generalized Polar Wind (GPW) model of ionospheric outflows and a magnetohydrodynamic code for simulating the magnetosphere. The GPW is a macroscopic Particle-In-Cell (mac-PIC) code. It will be coupled to the Block Adaptive Tree Solar wind Roe-type Upwind Scheme (BATS-R-US) MHD model using a system called the Space Weather Modeling Framework. The codes will be used to perform a set of simulations, representing a combination of terrestrial season, level of solar flux, and level of magnetospheric activity. The results from the coupled models will be compared to uncoupled results to illuminate the role of the ionospheric plasma in magnetospheric dynamics. To validate and refine the simulation results, a climatological observation set of outflowing plasma both in the ionosphere and within the magnetosphere will be constructed from historical data sets. The climatological model will be binned by season, magnetic activity, and location. Event simulations will be performed and compared with the climatological data to investigate transient dynamics. This project will advance our understanding of the role of the Earth's ionospheric environment in filling its magnetospheric space environment with plasma. The data-model comparisons, both on a climatological and event-study level, will advance the accuracy of ionospheric outflow models and Geospace General Circulation Models. The coupling of an ionospheric outflow model to an MHD model of the magnetosphere will add a fundamentally important element to our ability to forecast the dynamics of the magnetosphere.

该项目将把对整个磁层-电离层系统电离层离子的联合收割机观测与电离层外流的广义极风模型和模拟磁层的磁流体动力学代码结合起来。 GPW是一个宏观的粒子在细胞（mac-PIC）代码。它将使用一个称为空间气象建模框架的系统与块自适应树型太阳风Roe-type逆风方案MHD模型耦合。这些代码将用于进行一系列模拟，模拟地球季节、太阳通量水平和磁层活动水平。耦合模型的结果将与非耦合结果进行比较，以阐明电离层等离子体在磁层动力学中的作用。 为了验证和改进模拟结果，将根据历史数据集建立电离层和磁层内流出等离子体的气候观测集。气候模型将按季节、磁场活动和位置分类。将进行事件模拟，并与气候数据进行比较，以研究瞬态动力学。该项目将增进我们对地球电离层环境在用等离子体填充磁层空间环境方面的作用的了解。在气候学和事件研究两个层面上进行的数据-模型比较将提高电离层外流模型和地球空间大气环流模型的准确性。电离层外流模型与磁层MHD模型的耦合将为我们预测磁层动态的能力增加一个根本性的重要因素。