Collaborative Research: Energetic Particle Precipitation Mechanisms in the Inner Magnetosphere: Van Allen Probes and Incoherent Scatter Radar Coordinated Measurements
合作研究:内磁层中的高能粒子沉淀机制:范艾伦探头和非相干散射雷达协调测量
基本信息
- 批准号:1732367
- 负责人:
- 金额:$ 12.14万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:2017
- 资助国家:美国
- 起止时间:2017-09-01 至 2021-08-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
This project will examine the mechanisms by which charged particles in Earth's magnetic field travel both out of and through the atmosphere. Identifying these mechanisms is important for understanding how the various layers of the near-Earth environment are coupled. Understanding the neutral and charged atmosphere has become of increasing interest for understanding the background in which space weather events play. Data from NSF supported facilities such as the Advanced Modular Incoherent Scatter Radar (AMISR) will be analyzed in conjunction with space craft data. This award will also fund two postdoctoral researchers.Current particle precipitation theories assume that energetic particles in the magnetosphere precipitate into the atmosphere after undergoing pitch-angle scattering into the loss cone due to interactions with waves at or near the geomagnetic equator. However, the experimental verification of the effect of the multiple candidate waves on the particles' pitch-angle distributions has not been definitively established. This project brings together height-resolved measurements of ionization in the ionosphere, in situ measurements of pitch-angle scattering in the inner magnetosphere, and multidisciplinary expertise to achieve closure for all wave modes that may be involved in electron precipitation mechanisms. Instances of temporally coincident Van Allen Probes' measurements of particles and waves in the radiation belt (or ring current) and Poker Flat Incoherent Scatter Radar (PFISR) measurements of particles precipitating into the ionosphere near the foot-point of the Van Allen Probes' flux tubes will be identified. The loss-cone distribution functions created by candidate waves for pitch-angle scattering using the quasi-linear diffusion equations will be calculated. Changes in the phase-space distribution of electrons that are produced by the electric and magnetic wave fields in the frequency range from a few Hz to several kHz will be quantified by applying UCLAs Full Diffusion Code to Van Allen Probes' particle and field measurements. Finally, a comparison of the ionization profiles produced in the atmosphere by loss cone distributions calculated from Van Allen Probes' data with the ionization profiles directly measured with PFISR.
该项目将研究地球磁场中的带电粒子在大气层外和大气层中传播的机制。确定这些机制对于了解近地环境的不同层次是如何耦合的很重要。了解中性和带电大气层对于了解空间气象事件发生的背景越来越感兴趣。将结合航天器数据分析来自美国国家科学基金会支持的设施的数据,如高级模块化非相干散射雷达(阿米西里雷达)。该奖项还将资助两名博士后研究人员。目前的粒子沉淀理论假设,由于与地磁赤道或附近的波相互作用,磁层中的高能粒子经过俯仰角散射进入损失锥后,沉淀到大气中。然而,多个候选波对颗粒俯仰角分布影响的实验验证还没有得到明确的证实。该项目汇集了对电离层电离的高分辨率测量、对内磁层俯仰角散射的现场测量以及多学科的专门知识,以实现关闭可能涉及电子沉淀机制的所有波模。将识别在时间上一致的Van Allen探测器对辐射带(或环电流)中的粒子和波的测量以及对Van Allen探测器通量管脚点附近进入电离层的粒子的扑克平坦非相干散射雷达(PFISR)测量的实例。利用拟线性扩散方程,计算俯仰角散射的候选波产生的损失锥分布函数。在几赫兹到几千赫兹的频率范围内,电波场和磁波场产生的电子的相空间分布的变化将通过将UCLAS全扩散代码应用于Van Allen探测器的粒子和场测量来量化。最后,比较了由Van Allen探测器数据计算的损耗锥分布在大气中产生的电离分布与用PFISR直接测量的电离分布。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Jacob Bortnik其他文献
Resonant Scattering of Near-Equatorially Mirroring Electrons by Landau Resonance With H+ Band EMIC Waves
H 波段 EMIC 波朗道共振导致近赤道镜像电子的共振散射
- DOI:
10.1029/2018gl079718 - 发表时间:
2018 - 期刊:
- 影响因子:5.2
- 作者:
Song Fu;Binbin Ni;Yuequn Lou;Jacob Bortnik;Yasong Ge;Xin Tao;Xing Cao;Xudong Gu;Zheng Xiang;Wenxun Zhang;Yang Zhang;Qi Wang - 通讯作者:
Qi Wang
Distribution and Evolution of Chorus Waves Modeled by a Neural Network: The Importance of Imbalanced Regression
由神经网络建模的合唱波的分布和演化:不平衡回归的重要性
- DOI:
10.1029/2023sw003524 - 发表时间:
2023 - 期刊:
- 影响因子:0
- 作者:
Xiangning Chu;Jacob Bortnik;Wen Li;X. Shen;Q. Ma;Donglai Ma;D. Malaspina;Sheng Huang - 通讯作者:
Sheng Huang
The Response of Ionospheric Currents to External Drivers Investigated Using a Neural Network‐Based Model
使用基于神经网络的模型研究电离层电流对外部驱动器的响应
- DOI:
- 发表时间:
2023 - 期刊:
- 影响因子:3.7
- 作者:
Xin Cao;Xiangning Chu;Jacob Bortnik;J. Weygand;Jinxing Li;Homayon Aryan;Donglai Ma - 通讯作者:
Donglai Ma
Jovian lightning whistles a new tune
木星闪电奏响了新的曲调
- DOI:
10.1038/s41550-018-0483-3 - 发表时间:
2018-06-06 - 期刊:
- 影响因子:14.300
- 作者:
Jacob Bortnik - 通讯作者:
Jacob Bortnik
Jacob Bortnik的其他文献
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{{ truncateString('Jacob Bortnik', 18)}}的其他基金
GEM: From the Micro to the Macro--Identifying the Mechanisms Responsible for Megaelectron-Volt (MeV) Electron Microbursts and Quantifying Their Role in Global Radiation Belt Losses
GEM:从微观到宏观——确定兆电子伏(MeV)电子微爆发的机制并量化其在全球辐射带损失中的作用
- 批准号:
2025706 - 财政年份:2020
- 资助金额:
$ 12.14万 - 项目类别:
Standard Grant
GEM: Transit-time Scattering of Energetic Electrons
GEM:高能电子的渡越时间散射
- 批准号:
1103064 - 财政年份:2011
- 资助金额:
$ 12.14万 - 项目类别:
Continuing Grant
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Cell Research
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- 批准号:10774081
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