GSTDTAP
项目编号1744099
Simulations and Theory of Lightning Initiation in Low Thundercloud Fields
Victor Pasko
主持机构Pennsylvania State Univ University Park
项目开始年2018
2018-05-15
项目结束日期2021-04-30
资助机构US-NSF
项目类别Continuing grant
项目经费181295(USD)
国家美国
语种英语
英文摘要This study seeks to theoretically investigate the lightning initiation in low thundercloud fields, that currently represents a fundamental unsolved problem in lightning discharge physics. The research promises to answer questions about the frequency of relevant hydrometeor (rain/snow/ice in cloud) collisions, the kind of discharge process or streamer activity that would be triggered, and the likelihood of conditions required for such discharge activity to escape and continue to develop on larger scales. A better understanding of electric fields around small particles could be of interest to industries like powder-coating and laser printing. The work includes training of young scientists and enables support of undergraduate research.

The investigators will, first, quantify the electric field between two spherical hydrometeors using the image charge method and between two non-spherical hydrometeors using the Poisson's equation, and apply the avalanche to streamer transition criteria to observe whether streamer initiation is possible. Second, the investigators will develop a fluid model consisting of continuity equations for positive and negative ions, and electrons coupled with Poisson's equation. Third, the investigators will apply streamer models to describe the streamer development between the two hydrometeors and the streamer escape to open space.

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.
文献类型项目
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/72619
专题环境与发展全球科技态势
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Victor Pasko.Simulations and Theory of Lightning Initiation in Low Thundercloud Fields.2018.
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