CAREER: Exploring Mysterious Whistler Mode Waves in Earth's Plasmaspheric Plumes

职业：探索地球等离子层羽流中神秘的惠斯勒模式波

• 批准号: 1847818
• 负责人: Wen Li
• 金额: $ 76.46万
• 依托单位: Trustees of Boston University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-05-01 至 2025-04-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1847818&HistoricalAwards=false
• 关键词: CAREER; Exploring; Mysterious; Whistler; Mode

This project investigates how very low frequency radio waves, known as whistler mode waves, affect the Earth's Radiation Belt dynamics. Lightning produces whistler waves, which travel along the Earth's magnetic field lines. Understanding these waves and how they are amplified is important to national security and commercial interests. Military and commercial communications utilize the same very low frequency radio wavelengths and are therefore disrupted by whistler waves. The resulting scientific results will lead to improvement of predictive space weather models. This fits directly into the goals of the National Space Weather Strategy and Action Plan, released in 2015. The project supports a female faculty member and will train and educate graduate and undergraduate students in both research and outreach activities. The proposed outreach program will target K-12 students through development of interactive in-class presentations, hands-on activities, and tours of the BU observatory and planetarium. The outreach will engage undergraduate and graduate students in both research and communicating space science to the public.Whistler mode waves in plasmaspheric plumes exhibit unexpectedly large amplitudes that suggest that waves in this region are very effective in driving energetic electron precipitation. Currently, radiation belt models do not incorporate this effect. In order to understand the role whistler waves in plasmaspheric plumes play on radiation belt dynamics, this award will combine theory, modeling, and data analysis. Quasilinear diffusion theory will be used to evaluate electron scattering due to wave-particle interactions. This will be combined with modeling from a Full Diffusion code to calculate electron diffusion coefficients and a 3D diffusion code to simulate radiation belt electron dynamics. Analysis of observations from multiple spacecraft, including the Van Allen Probes, THEMIS, POES/MetOp, and GPS, will establish density, wave, and particle properties associated with the generation of whistler waves in plasmaspheric plumes. The data will be compared to the developed model to answer the science questions. The study is unique in that it focuses on whistler waves generated in plumes, a region not previously investigated.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.

该项目研究了非常低的频率无线电波如何影响地球的辐射带动力学。闪电会产生惠斯勒波，沿着地球的磁场线路传播。了解这些浪潮及其放大方式对国家安全和商业利益很重要。军事和商业通信利用了相同的低频无线电波长，因此被惠斯勒波浪扰乱。由此产生的科学结果将导致预测空间天气模型的改善。这直接符合2015年发布的国家太空天气战略和行动计划的目标。该项目支持一名女教师，并将在研究和外展活动中培训和教育研究生和本科生。拟议的外展计划将通过开发BU天文台和天文馆的互动课堂演示，动手活动以及参观的互动式演讲，动手演讲，针对K-12学生。外展活动将吸引本科生和研究生参与研究和将太空科学传达给公共的空间科学。等离子间羽毛中的Whistler模式波显示出意外的大型振幅，表明该地区的波浪在驱动能量的电子降水方面非常有效。当前，辐射带模型不包含此效果。为了了解惠斯勒羽毛在辐射皮带动力学上发挥作用的作用，该奖项将结合理论，建模和数据分析。准线性扩散理论将用于评估由于波粒相互作用引起的电子散射。这将与从完整扩散代码的建模结合使用，以计算电子扩散系数和3D扩散代码，以模拟辐射带电子动力学。分析来自多个航天器的观测值，包括范艾伦探针，Themis，POES/METOP和GPS，将建立与等离子体羽流中惠斯勒波的产生相关的密度，波和粒子特性。数据将与开发的模型进行比较，以回答科学问题。这项研究的独特之处在于它的重点是李子中产生的惠斯勒波，该地区以前未曾进行过研究。该奖项反映了NSF的法定任务，并且使用基金会的知识分子优点和更广泛的审查标准，被认为值得通过评估来获得支持。

项目成果

Electron Scattering by Very‐Low‐Frequency and Low‐Frequency Waves From Ground Transmitters in the Earth's Inner Radiation Belt and Slot Region

• DOI: 10.1029/2022ja030349
• 发表时间: 2022-06
• 期刊: Journal of Geophysical Research: Space Physics
• 作者: Q. Ma;W. Gu;S. Claudepierre;W. Li;J. Bortnik;M. Hua;X. Shen

Relativistic Electron Precipitation Near Midnight: Drivers, Distribution, and Properties

• DOI: 10.1029/2021ja030111
• 发表时间: 2022-01
• 期刊: Journal of Geophysical Research: Space Physics
• 作者: L. Capannolo;W. Li;R. Millan;D. Smith;Nithin Sivadas;J. Sample;S. Shekhar

Global Survey of Electron Precipitation due to Hiss Waves in the Earth’s Plasmasphere and Plumes

• DOI: 10.1029/2021ja029644
• 发表时间: 2021-08
• 期刊: Journal of Geophysical Research: Space Physics
• 作者: Q. Ma;Wen Li;X.‐J. Zhang;J. Bortnik;X. Shen;H. Connor;A. Boyd;W. Kurth;G. Hospodarsky;S. Claudepierre;G. Reeves;H. Spence

Properties of Whistler Mode Waves in Earth's Plasmasphere and Plumes

• DOI: 10.1029/2018ja026041
• 发表时间: 2019-02
• 期刊: Journal of Geophysical Research: Space Physics
• 作者: R. Shi;Wen Li;Q. Ma;Alex Green;C. Kletzing;W. Kurth;G. Hospodarsky;S. Claudepierre;H. Spence;G. Reeves

Statistical Study of Chorus Modulations by Background Magnetic Field and Plasma Density

背景磁场和等离子体密度合唱调制的统计研究

• DOI: 10.1029/2020gl089344
• 发表时间: 2020
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: Xia, Zhiyang;Chen, Lunjin;Li, Wen
• 通讯作者: Li, Wen