Collaborative Research: Causes and Consequences of Relativistic Electron Precipitation as Revealed by the CubeSat Mission ELFIN’s Pitch-Angle Resolved Loss Cone Measurements

合作研究：立方体卫星任务 ELFIN 的俯仰角解析损耗锥测量揭示的相对论电子沉淀的原因和后果

• 批准号: 2019950
• 负责人: Wen Li
• 金额: $ 12.03万
• 依托单位: Trustees of Boston 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: 2020-07-01 至 2024-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2019950&HistoricalAwards=false
• 关键词: Collaborative; Research; Causes; Consequences; Relativistic

The jointly funded NSF/NASA ELFIN mission consists of two identical CubeSats on a polar (~ 93 degree inclination), nearly circular, low-Earth orbit. ELFIN was launched on September 15, 2018 and is currently operating within the geospace environment. This funding will address the prime mission objective of analyzing the data currently being collected by ELFIN to advance understanding of wave-particle interactions and their effect on relativistic electrons in the outer radiation belt. Two undergraduate students, a graduate student, and three early career scientists will be supported. ELFIN data products are integrated into courses at UCLA and in public outreach events in the Los Angeles area.The project will utilize ELFIN, together with its conjunctions with other, equatorial Heliophysics missions to address the efficacy of EMIC wave precipitation, and the relative contribution of EMIC, whistlers and kinetic Alfvén waves in the observed relativistic electron scattering (100s of keV to a few MeV energy). The specific science objectives are: (1) Are EMIC waves responsible for 0.5-2MeV electron precipitation?(2) Are waves other than EMIC waves (principally chorus waves and kinetic Alfvén waves (KAWs)), also responsible for significant relativistic electron scattering? (3) What are the typical precipitation rates associated with various wave types as function of geomagnetic conditions?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.

NSF/NASA 联合资助的 ELFIN 任务由两个相同的立方体卫星组成，ELFIN 于 2018 年 9 月 15 日在极地（约 93 度倾角）近地轨道上发射，目前正在地球空间环境中运行。两名本科生将解决分析 ELFIN 当前收集的数据的主要任务目标，以增进对波粒相互作用及其对外辐射带相对论电子的影响的理解。学生、研究生和三名早期职业科学家将获得支持，将 ELFIN 数据产品纳入加州大学洛杉矶分校的课程和洛杉矶地区的公共宣传活动中。该项目将利用 ELFIN 及其与其他赤道太阳物理学的结合。任务旨在解决 EMIC 波降水的功效，以及 EMIC、啸声和动能阿尔文波在观测到的相对论电子散射（100 keV 到几 MeV）中的相对贡献具体的科学目标是：(1) EMIC 波是否造成 0.5-2MeV 电子沉淀？(2) EMIC 波以外的波（主要是合唱波和动能阿尔文波 (KAW)）是否也造成显着的相对论性。 (3) 与地磁条件函数相关的各种波类型的典型降水率是多少？该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准。

项目成果

Energetic Electron Precipitation Observed by FIREBIRD‐II Potentially Driven by EMIC Waves: Location, Extent, and Energy Range From a Multievent Analysis

FIREBIRD II 观测到的高能电子沉淀可能由 EMIC 波驱动：多事件分析的位置、范围和能量范围

• DOI: 10.1029/2020gl091564
• 发表时间: 2021-02-01
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: L. Capannolo;W. Li;H. Spence;A. Johnson;M. Shumko;J. Sample;D. Klumpar
• 通讯作者: D. Klumpar

Characteristics of Electron Precipitation Directly Driven by Poloidal ULF Waves

极向超低频波直接驱动电子沉淀的特性

• DOI: 10.1029/2022ja031163
• 发表时间: 2023-02-27
• 期刊: Journal of Geophysical Research: Space Physics
• 作者: Z. Yin;Xuzhi Zhou;Wen Li;X. Shen;R. Rankin;Ji Liu;Zejun Hu;Jianjun Liu;Q. Zong;Li Li
• 通讯作者: Li Li

Identification and Classification of Relativistic Electron Precipitation at Earth Using Supervised Deep Learning

使用监督深度学习对地球上的相对论电子降水进行识别和分类

• DOI: 10.3389/fspas.2022.858990
• 发表时间: 2022-03-24
• 期刊: Journal of Geophysical Research. Space Physics
• 作者: L. Capannolo;Wen Li;Sheng Huang
• 通讯作者: Sheng Huang

Modeling the Simultaneous Dropout of Energetic Electrons and Protons by EMIC Wave Scattering

通过 EMIC 波散射模拟高能电子和质子的同时消失

• DOI: 10.1029/2022gl101041
• 发表时间: 2022-10-18
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: X. Lyu;Q. Ma;W. Tu;Wen Li;L. Capannolo
• 通讯作者: L. Capannolo

Dependence of Relativistic Electron Precipitation in the Ionosphere on EMIC Wave Minimum Resonant Energy at the Conjugate Equator

电离层中相对论性电子沉淀对共轭赤道处EMIC波最小共振能量的依赖性

• DOI: 10.1029/2021ja029193
• 发表时间: 2021-05-01
• 期刊: Journal of Geophysical Research: Space Physics
• 作者: X.‐J. Zhang;D. Mourenas;Xiao‐Chen Shen;M. Qin;A. Artemyev;Qianli Ma;Wen Li;Mary Hudson;V. Angelopoulos
• 通讯作者: V. Angelopoulos