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: 2019914
• 负责人: Vassilis Angelopoulos
• 金额: $ 38.76万
• 依托单位: University of California-Los Angeles
• 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=2019914&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.

共同资助的NSF/NASA ELFIN任务由两个相同的立方体组成（〜93度倾斜），几乎是圆形的低地球轨道。 Elfin于2018年9月15日启动，目前在地理空间环境中运行。这项资金将解决分析Elfin目前收集的数据的主要任务目标，以提高对波颗粒相互作用的了解及其对外部辐射带中相对论电子的影响。将支持两名本科生，一名研究生和三名早期职业科学家。 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 combinations with other, equitorious Heliophysics missions to address the efficiency 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 活力）。特定的科学目标是：（1）EMIC波是否负责0.5-2MEV电子沉淀？（2）除了EMIC波（主要是合唱波和动力学的Alfvén波（KAWS））以外的波是否是否也负责有效的相关电子散射？ （3）与各种波动类型相关的典型降水率是什么？作为地磁条件的功能，该奖项反映了NSF的法定任务，并使用基金会的知识分子优点和更广泛的影响标准，认为通过评估被认为是宝贵的支持。

项目成果

Role of Ducting in Relativistic Electron Loss by Whistler‐Mode Wave Scattering

• DOI: 10.1029/2021ja029851
• 发表时间: 2021-10
• 期刊: Journal of Geophysical Research: Space Physics
• 作者: A. Artemyev;A. Demekhov;X.‐J. Zhang;V. Angelopoulos;D. Mourenas;Y. Fedorenko;J. Maninnen;E. Tsai;C. Wilkins;S. Kasahara;Y. Miyoshi;A. Matsuoka;Y. Kasahara;T. Mitani;Y. Shoichiro;K. Keika;T. Hori;S. Matsuda;S. Nakamura;M. Kitahara;T. Takashima;I. Shinohara

Bursty Energetic Electron Precipitation by High‐Order Resonance With Very‐Oblique Whistler‐Mode Waves

• DOI: 10.1029/2022gl101920
• 发表时间: 2023-04
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: L. Gan;A. Artemyev;Wen Li;Xiao‐jia Zhang;Q. Ma;D. Mourenas;V. Angelopoulos;E. Tsai;C. Wilkins

ELFIN observations of energetic electron precipitation and backscatter: implication for losses, atmospheric effects, and magnetospheric populations.

高能电子沉淀和反向散射的 ELFIN 观测：对损失、大气效应和磁层群体的影响。

• 发表时间: 2020
• 期刊: Fall AGU 2020
• 作者: Angelopoulos, V.

The ELFIN Mission

• DOI: 10.1007/s11214-020-00721-7
• 发表时间: 2020-07-30
• 期刊: SPACE SCIENCE REVIEWS
• 影响因子: 10.3
• 作者: Angelopoulos, V;Tsai, E.;Zhang, G. Y.
• 通讯作者: Zhang, G. Y.

On the Nature of Intense Sub‐Relativistic Electron Precipitation

论强亚相对论电子沉淀的本质

• DOI: 10.1029/2022ja030571
• 发表时间: 2022
• 期刊: Journal of Geophysical Research: Space Physics
• 作者: Artemyev, A. V.;Zhang, X. ‐J.;Zou, Y.;Mourenas, D.;Angelopoulos, V.;Vainchtein, D.;Tsai, E.;Wilkins, C.
• 通讯作者: Wilkins, C.