| 项目编号: | 1357893
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| 项目名称: | SHINE: Statistical Analysis of Magnetic Helicity of the Solar Wind Turbulence at Kinetic Scales |
| 作者: | Bernard Vasquez
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| 承担单位: | University of New Hampshire
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| 批准年: | 2013
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| 开始日期: | 2014-06-01
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| 结束日期: | 2018-05-31
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| 资助金额: | USD329573
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| 资助来源: | US-NSF
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| 项目类别: | Continuing grant
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| 国家: | US
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| 语种: | 英语
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| 特色学科分类: | Geosciences - Atmospheric and Geospace Sciences
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| 英文关键词: | magnetic helicity
; cross-helicity
; interplanetary turbulence
; kinetic scale
; background solar wind
; large-scale magnetohydrodynamic turbulence
; solar wind
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| 英文摘要: | The research agenda of this project directly addresses the SHINE goal of "understanding or characterizing the background solar wind and how it evolves." The outcome of the research work will advance the understanding of interplanetary turbulence at the kinetic scales. This project is expected to provide fundamental new insights in space physics regarding how collisionless dissipation of large-scale magnetohydrodynamic turbulence actually proceeds in the solar wind. The overall effort includes the participation of students from the University of New Hampshire. The research and EPO agenda of this SHINE project supports the Strategic Goals of the AGS Division in discovery, learning, diversity, and interdisciplinary research.
The main goal of this 3-year SHINE project is to study the magnetic helicity associated with interplanetary turbulent fluctuations in the proton kinetic range. The magnetic helicity is a sensitive indicator of the physical processes responsible for the turbulent energy cascade. The project team will use spacecraft data from Wind to determine the statistical properties of the magnetic helicity. The distribution of the helicity with the scale convected past the spacecraft will be described by the value and position attained at the peak and also its width at half maximum. These properties will be studied as functions of the amplitude of the fluctuations, the plasma beta, and the cross-helicity. The spectral properties of the magnetic helicity will be calculated using both global and local mean magnetic fields from the same data sets. This will allow a direct comparison between the obtained statistical results of these two techniques. Three-dimensional hybrid numerical simulations with particle ions and fluid electrons will also be used to interpret the results found in each approach.
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| 资源类型: | 项目
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/96857
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| Appears in Collections: | 影响、适应和脆弱性
气候减缓与适应
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| Recommended Citation: | |
Bernard Vasquez. SHINE: Statistical Analysis of Magnetic Helicity of the Solar Wind Turbulence at Kinetic Scales. 2013-01-01.
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