CEDAR: Data-driven Modeling of the Global Equatorial Electrojet Variability

CEDAR：全球赤道电喷射变率的数据驱动建模

• 批准号: 2231409
• 负责人: Tomoko Matsuo
• 金额: $ 40.73万
• 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: 2023
• 资助国家: 美国
• 起止时间: 2023-09-01 至 2026-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2231409&HistoricalAwards=false
• 关键词: CEDAR; Data; driven; Modeling; Global; CEDAR; Data; driven; Modeling; Global

The Earth's low- and mid-latitude ionosphere hosts a variety of complex phenomena resulting from the coupled dynamics of plasma and neutral species under the influence of Earth’s magnetic field. This region is furthermore exposed to constantly varying conditions of both terrestrial and space weather, giving rise to considerable day-to-day variability that is highly dependent on longitudes. This project will use a comprehensive data-driven modeling approach to close the gap in our understanding of the origins of the observed longitudinal and day-to-day variability of daytime large-scale low- to mid-latitude electrodynamics phenomena with a focus on equatorial electrojet (EEJ). The outcome of this project will likely help us to better characterize the plasma structure in the near-Earth space environment, which is key to the forecasting of plasma irregularity and radio wave scintillation that affect communication, navigation, and positioning systems. The project will serve to broaden the education and training experiences of one graduate student at CU-Boulder and three undergraduate students recruited through the Boulder Solar Alliance REU program.The development of the data-driven modeling approach will be guided by a four-dimensional ensemble variational formulation, which is a hybrid of the variational and ensemble approach being built for the NCAR Thermosphere Ionosphere Electrodynamics General Circulation Model (TIEGCM). The approach takes advantage of the capabilities of the 3-D Electrodynamo model which can specify ground and low-Earth-orbit (LEO) magnetic perturbations and 3D ionospheric currents driven by wind dynamo and high-latitude ionospheric convection electric fields. Specific science questions addressed include: • What are the causes of the observed day-to-day variability of EEJ?; To what extent is its longitudinal dependence controlled by the geometry and magnitude of geomagnetic fields, and by the atmospheric waves originating from longitudinal asymmetric sources on the Earth's surface?• What is the connection of the EEJ day-to-day variability to the variability of equatorial plasma drifts, equatorial ionization anomaly (EIA), as well as equatorial counter electrojet (CEJ) and solar quiet (Sq) currents? The primary observational data that will be assimilated includes magnetic fields from a network of ground-based magnetometers, LEO magnetic fields measured by Swarm and electron density and plasma drift measurements obtained from COSMIC-2 and ICON missions. Analysis results will be compared and verified against independent observations of plasma drifts, plasma densities and neutral winds from ground-based observational networks, including incoherent and coherent scatter radars, ionosondes, Fabry-Perot interferometers, and Global Navigation Satellite System receivers as well as neutral winds from ICON.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

地球的低和中纬度电离层在地球磁场的影响下，由等离子体和中性物种的耦合动力学产生了各种复杂现象。该地区进一步暴露于陆地和太空天气的不断变化的条件，从而高度取决于纵向，从而导致相当大的日常变异性。该项目将使用一种全面的数据驱动建模方法来缩小我们对观察到的纵向和日常变化的起源的差距，这些纵向和日常变化的差异是大规模的低度电子现象，重点是备列式电子夹克（EEJ）。该项目的结果可能会帮助我们更好地表征近地太空环境中的等离子体结构，这是对影响通信，导航和定位系统的血浆不规则性和无线电波闪烁的预测的关键。项目将有助于扩大Cu-Boulder一名研究生的教育和培训经验以及通过Boulder太阳能联盟REU计划招募的三名本科生。数据驱动的建模方法的开发将以四维整体变化公式为指导，这是构建的循环型和循环的循环模型，用于各种循环系统，用于各种循环系统。 （tiegcm）。该方法利用了3-D Electrodynamo模型的功能，该模型可以指定地面和低地面 - 轨道（LEO）磁扰动以及由风力发电机和高纬度电离层连接电场驱动的3D电离层电流。解决的具体科学问题包括：•EEJ观察到的日常变异性的原因是什么？它的纵向依赖性在多大程度上由地磁场的几何形状和幅度控制，以及来自地球表面上纵向不对称来源的大气波，•EEJ日常日常变化与等价等级的差异，等值的求和式求和式Anome（eeje）以及等值的变化（EEJ）的连接是什么安静（平方）电流？将被吸收的主要观察数据包括来自地面磁力计网络的磁场，通过群体和电子密度和等离子钻测量的LEO磁场，从宇宙-2和图标任务中获得的磁场。将比较和验证分析结果，并与对地面观察网络的血浆钻，血浆密度和中性风的独立观察结果进行比较和验证基金会的智力优点和更广泛的影响评论标准。