The Origin of Plasmaspheric Hiss
等离子层嘶嘶声的起源
基本信息
- 批准号:0840178
- 负责人:
- 金额:$ 33.99万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:2009
- 资助国家:美国
- 起止时间:2009-09-01 至 2014-08-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Plasmaspheric hiss is an incoherent, band-limited emission found predominantly in the dense-plasma region surrounding the Earth, known as the plasmasphere. Hiss propagates as an electromagnetic plasma wave in the whistler mode, and is able to resonate with the high-energy electrons in the Van Allen radiation belts. The importance of hiss in controlling the structure and dynamics of the radiation belts has long been established, but the origin of hiss itself has been an open problem for over four decades. This project will develop a newly discovered mechanism involving chorus waves that appears to be able to naturally account for the observed frequency band, the incoherent nature, the day/night asymmetry, and the dependence on geomagnetic activity. An existing numerical ray tracing code will be used to calculate wave propagation, together with Landau damping using fluxes measured by the Combined Release and Radiation Effects Satellite (CRRES). By properly weighting the power distribution of chorus waves and tracking the evolution of chorus into hiss using ray tracing, the distribution of hiss intensity, frequency band, and wave normal angle will be quantified as a function of distance from the Earth, magnetic local time, and latitude. The effects of geomagnetic activity on the distribution of hiss characteristics will then be analyzed by recalculating the ray database under a number of different magnetospheric conditions. In the final year of the study, the project will determine contribution to hiss from (a) global lightning activity, (b) the effects of azimuthal propagation, and (c) propagation in plasmaspheric plumes. The computed hiss distributions will be compared with observations from satellite measurements. The research will be done primarily by a young research scientist and a postdoctoral scholar. Understanding the physics of the radiation belts is important to understanding and being able to forecast space weather.
等离子体的嘶嘶声是一种非相干的、带限制的发射,主要存在于地球周围的致密等离子体区域,即等离子体层。在哨声模式下,嘶嘶声以电磁等离子体波的形式传播,并且能够与范艾伦辐射带中的高能电子产生共振。在控制辐射带的结构和动力学方面,嘶嘶声的重要性早已确立,但嘶嘶声本身的起源在四十多年来一直是一个悬而未决的问题。该项目将开发一种涉及合唱波的新发现机制,这种机制似乎能够自然地解释观测到的频带、非相干性、昼夜不对称性以及对地磁活动的依赖。现有的数值射线追踪代码将用于计算波的传播,以及使用释放和辐射效应联合卫星(CRRES)测量的通量计算朗道阻尼。通过适当地加权合唱波的功率分布,并使用射线追踪跟踪合唱波向嘶嘶的演变,可以将嘶嘶强度、频带和波法向角的分布量化为与地球的距离、磁地方时和纬度的函数。然后,将通过重新计算若干不同磁层条件下的射线数据库来分析地磁活动对hiss特征分布的影响。在研究的最后一年,该项目将确定以下因素对嘶嘶的贡献:(a)全球闪电活动,(b)方位传播的影响,以及(c)等离子体羽流的传播。计算得到的噪声分布将与卫星观测结果进行比较。这项研究将主要由一名年轻的研究科学家和一名博士后学者完成。了解辐射带的物理特性对于理解和预测太空天气非常重要。
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:
$ 33.99万 - 项目类别:
Standard Grant
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
- 批准号:
1732367 - 财政年份:2017
- 资助金额:
$ 33.99万 - 项目类别:
Continuing 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:
$ 33.99万 - 项目类别:
Continuing Grant
相似海外基金
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 - 财政年份:2019
- 资助金额:
$ 33.99万 - 项目类别:
Continuing Grant
Ionospheric-plasmaspheric variations and mechanism from multi-satellite space-based GNSS measurements
多星天基 GNSS 测量的电离层-等离子体层变化和机制
- 批准号:
392206641 - 财政年份:2018
- 资助金额:
$ 33.99万 - 项目类别:
Research Grants
Simulation Studies of Plasmaspheric Plume Density Structure/Ion Composition and Plume Plasma Transport to Dayside Magnetopause and Polar Cap
等离子体球羽流密度结构/离子组成和羽流等离子体传输到白天磁层顶和极冠的模拟研究
- 批准号:
1248242 - 财政年份:2014
- 资助金额:
$ 33.99万 - 项目类别:
Continuing Grant
AGS-PRF: Identifying the Origin of Plasmaspheric Hiss and the Impact of Magnetospheric Chorus on Radiation Belt Dynamics
AGS-PRF:确定等离子体层嘶嘶声的起源以及磁层合唱对辐射带动力学的影响
- 批准号:
1137411 - 财政年份:2011
- 资助金额:
$ 33.99万 - 项目类别:
Fellowship Award
GEM: Empirical Modeling of Plasmaspheric Density Distribution and Investigations of Plasmaspheric Dynamic
GEM:等离子体球密度分布的经验模型和等离子体球动力学研究
- 批准号:
0902965 - 财政年份:2009
- 资助金额:
$ 33.99万 - 项目类别:
Standard Grant
GEM: Quantitative Estimates of Plasmaspheric Losses and Implications for Solar Wind-Magnetosphere Coupling
GEM:等离子体层损失的定量估计及其对太阳风磁层耦合的影响
- 批准号:
0902846 - 财政年份:2009
- 资助金额:
$ 33.99万 - 项目类别:
Continuing Grant
GEM-CEDAR Postdoc: Understanding MIC through Tomographic Imaging of the Ionospheric and Plasmaspheric Density Using Ground and Space-Based GPS Receiver
GEM-CEDAR 博士后:使用地面和天基 GPS 接收器通过电离层和等离子体层密度断层成像了解 MIC
- 批准号:
0524711 - 财政年份:2005
- 资助金额:
$ 33.99万 - 项目类别:
Continuing Grant
Coupling of Micro- and Meso-Scale Processes During Early Stage Plasmaspheric Refilling
早期血浆球再充填期间微观和介观尺度过程的耦合
- 批准号:
9529623 - 财政年份:1996
- 资助金额:
$ 33.99万 - 项目类别:
Continuing Grant
Wave Distribution Function Analysis of Plasmaspheric Hiss (Solar-Terrestrial Research)
等离子体层嘶嘶声的波分布函数分析(日地研究)
- 批准号:
8318186 - 财政年份:1984
- 资助金额:
$ 33.99万 - 项目类别:
Continuing Grant