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.

这个项目调查了非常低频率的无线电波，被称为哨声模式波，是如何影响地球辐射带动力学的。闪电会产生沿地球磁力线传播的哨声波。了解这些浪潮以及它们是如何被放大的，对国家安全和商业利益都很重要。军事和商业通信使用相同的极低频无线电波长，因此被哨声干扰。由此产生的科学结果将导致预测空间天气模型的改进。这直接符合2015年发布的《国家空间天气战略和行动计划》的目标。该项目支持一名女教员，并将在研究和推广活动方面培训和教育研究生和本科生。该计划将针对K-12学生，通过互动式课堂演讲、实践活动和参观波士顿大学天文台和天文馆。这项外展活动将吸引本科生和研究生参与研究并向公众传播空间科学。等离子体羽流中的惠斯勒模式波表现出出乎意料的大振幅，这表明该区域的波在驱动高能电子沉淀方面非常有效。目前，辐射带模型没有考虑到这种影响。为了了解等离子体羽流中的哨声波在辐射带动力学中的作用，该奖项将结合理论、建模和数据分析。拟线性扩散理论将用于评价由于波粒相互作用而引起的电子散射。这将与全扩散代码的建模相结合，以计算电子扩散系数和三维扩散代码来模拟辐射带电子动力学。对包括范艾伦探测器、THEMIS、POES/MetOp和GPS在内的多个航天器的观测结果进行分析，将建立与等离子体羽流中哨声波产生相关的密度、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，它专注于羽流中产生的哨声波，这是一个以前没有研究过的区域。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

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