| DOI: | 10.2172/1053964
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| 报告号: | Final Report
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| 报告题名: | Collaborative Research: Dynamics of Electrostatic Solitary Waves on Current Layers |
| 作者: | Pickett, Jolene S.
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| 出版年: | 2012
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| 发表日期: | 2012-10-31
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| 国家: | 美国
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| 语种: | 英语
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| 英文关键词: | Plasma Physics
; Electrostatic Solitary Waves
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| 中文主题词: | 电场
; 通信
; 磁场
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| 主题词: | ELECTRIC FIELD
; COMMUNICATIONS
; MAGNETIC FIELD
|
| 英文摘要: | The research carried out under the subject grant has provided insight into the generation of Electrostatic Solitary Waves (ESWs), which are nonlinear structures observed in space plasma data. These ESWs, appearing as pulses in the electric field time series data, represent the presence of several hundred meters to kilometer size positive potential structures, similar to champagne bubbles, where the electrons have been depleted, and which travel along Earth's magnetic field lines. The laboratory experiments carried out at the UCLA LAPD under the grant allowed us the opportunity to change various plasma and field conditions within the plasma device, and experiment with injection of suprathermal electron beams, in order to create ESWs. This then allowed us to determine the most likely method of generation of the ESWs. By comparing the properties of the ESWs observed in the LAPD to those observed in space and the plasma and field conditions under which those ESWs were observed in both locations, we were able to evaluate various ESW generation mechanisms. The findings of the laboratory experiments are that ESWs are generated through a lower hybrid instability. The ESWs observed in Earth's auroral current regions have similar characteristics to those generated by the laboratory when referenced to basic plasma and field characteristics, leading us to the conclusion that the lower hybrid drift instability is certainly a possibility for generation of the ESWs, at least in the auroral (northern/southern lights) regions. Due to space instrumentation insufficiencies and the limitations on telemetry, and thus poor time resolution, it is not possible to determine absolutely what generates these bubbles in space, but the laboratory experiments and supporting simulations have helped us to further our understanding of the processes under which they are generated. The public benefits from the findings of this research because the research is focused on current layers around Earth, which are affected by our Sun's activity. Understanding how these current layers are affected by the Sun provides insight into why radio communications are sometimes affected on Earth and how these layers help protect and facilitate our life on Earth. |
| URL: | http://www.osti.gov/scitech/servlets/purl/1053964
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| Citation statistics: |
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| 资源类型: | 研究报告
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/40798
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| Appears in Collections: | 过去全球变化的重建
影响、适应和脆弱性
科学计划与规划
气候变化与战略
全球变化的国际研究计划
气候减缓与适应
气候变化事实与影响
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| 1053964.pdf（266KB） | 研究报告 | -- | 开放获取 | | View
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| Recommended Citation: | |
Pickett, Jolene S.. Collaborative Research: Dynamics of Electrostatic Solitary Waves on Current Layers. 2012-01-01.
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