Collaborative Research: CEDAR--Experimental and Theoretical Investigation of Midlatitude Ionospheric Instability

合作研究：CEDAR——中纬度电离层不稳定性的实验和理论研究

• 批准号: 2012994
• 负责人: Miguel Larsen
• 金额: $ 27.03万
• 依托单位: Clemson University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2012994&HistoricalAwards=false
• 关键词: Collaborative; Research; CEDAR; Experimental; Theoretical

This research addresses long standing questions about space-weather phenomena in Earth's ionosphere, which can have drastic effects including on HF and VHF communications. The characteristics and causes of these phenomena remain poorly understood. The project has three main components: (i) numerical simulations and modeling of ionospheric irregularities and instabilities, (ii) experimental observations made with portable coherent scatter radar deployed by Cornell University and Clemson University as well as the Millstone Hill Observatory, and (iii) incoherent scatter radar observations at the Arecibo Observatory complemented by coherent scatter experiments from the island of Guadeloupe (using a radar to be installed as part of this project). The broader impacts of this work are through its applications to understanding space weather and via a strong educational component that assures extensive involvement of students at both universities.The aeronomy investigations focus on ionospheric phenomena including sporadic E layers (Es), medium-scale traveling ionospheric disturbances (MSTID), and plasma irregularities associated with mid-latitude spread-F conditions (MSF). The project examines both neutral/plasma and E region/F region coupling in a common physical context. The main goals pertain to 1) the nature of the plasma instabilities in the mid-latitude ionosphere, 2) the role of neutral atmosphere dynamics in the occurrence of MSF, 3) the nature of the coupling between the E and F regions, and 4) how these phenomena vary with latitude. By extending ground-based observations across North America, the researchers will study how E- and F-region plasma irregularities and instabilities are causally related. A new regional, coupled neutral/plasma dynamics model will be developed, which will allow going beyond idealized theoretical approaches toward a deeper understanding of space weather at middle latitudes. The broader impacts are through not only the applications to space weather but also the educational opportunities at Cornell University and Clemson University for undergraduate and graduate students.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.

这项研究解决了有关地球电离层中空间天气现象的长期问题，该问题可能会产生巨大影响，包括对HF和VHF通信。这些现象的特征和原因仍然知之甚少。该项目具有三个主要组成部分：（i）电离层不规则和不稳定性的数值模拟和建模，（ii）由康奈尔大学和克莱姆森大学以及米尔斯通山观测师部署的便携式相干散射雷达进行的实验观察结果，以及（iii）瓜德罗普岛（Guadeloupe）岛的连贯散射实验补充的Arecibo天文台的不一致的散射雷达观测（使用作为该项目的一部分安装的雷达）。这项工作的更广泛影响是通过其应用来了解太空天气以及通过强大的教育组成部分确保两所大学的学生广泛参与。航空调查的重点是电离层现象，包括零星E层（ES），中等规模的旅行电离层层层层层。与中纬度扩散f条件（MSF）相关的干扰（MSTID）和血浆不规则性。该项目在共同的物理环境下研究中性/血浆和E区域/F区域耦合。主要目标与1）中纬度电离层中血浆不稳定性的性质，2）中性大气动力学在MSF发生中的作用，3）E和F区域之间的耦合性质，以及4 ）这些现象如何随纬度而变化。通过扩展整个北美的地面观测，研究人员将研究电子和F区等离子体的不规则性和不稳定性如何因果关系。将开发出一种新的区域耦合中性/等离子体动力学模型，这将允许超越理想化的理论方法，以深入了解中纬度的空间天气。更广泛的影响不仅是通过对太空天气的申请，还包括康奈尔大学和克莱姆森大学的本科和研究生的教育机会。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子优点，以及通过基金会的知识分子优点和更广泛的影响审查标准。

项目成果

Gradient Winds and Neutral Flow Dawn‐Dusk Asymmetry in the Auroral Oval During Geomagnetically Disturbed Conditions

• DOI: 10.1029/2021ja029936
• 发表时间: 2021-12
• 期刊: Journal of Geophysical Research: Space Physics
• 作者: M. Larsen;R. Pfaff;R. Mesquita;S. Kaeppler

Using Temporal Relationship of Thermospheric Density With Geomagnetic Activity Indices and Joule Heating as Calibration for NRLMSISE‐00 During Geomagnetic Storms

• DOI: 10.1029/2021sw003017
• 发表时间: 2022-03
• 期刊: Space Weather
• 作者: Xin Wang;J. Miao;Xian Lu;Ercha Aa;B. Luo;Ji Liu;Yu-chao Hong;Yuxian Wang;Tinglin Ren;Ruiyun Zeng;Chenxi Du;Siqing Liu

VHF Imaging Radar Observations and Theory of Banded Midlatitude Sporadic E Ionization Layers

• DOI: 10.1029/2021ja029257
• 发表时间: 2021-04
• 期刊: Journal of Geophysical Research: Space Physics
• 作者: D. Hysell;M. Larsen

Quantifying day-to-day variability of O/N2 and its correlation with geomagnetic activity using GOLD

• DOI: 10.3389/fspas.2023.1129279
• 发表时间: 2023-02
• 作者: Benjamin C. Martinez;Xian Lu

Understanding Strong Neutral Vertical Winds and Ionospheric Responses to the 2015 St. Patrick's Day Storm Using TIEGCM Driven by Data‐Assimilated Aurora and Electric Fields

• DOI: 10.1029/2022sw003308
• 发表时间: 2023-02
• 期刊: Space Weather
• 作者: Xian Lu;Haonan Wu;S. Kaeppler;J. Meriwether;Y. Nishimura;Wenbin Wang;Jintai Li;Xueling Shi