Development of Efficient Models of Streamer to Leader Transition in the Earth's Atmosphere

地球大气层中主光向主光转变的有效模型的开发

• 批准号: 1332199
• 负责人: Victor Pasko
• 金额: $ 29.72万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-08-15 至 2017-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1332199&HistoricalAwards=false
• 关键词: Development; Efficient; Models; Streamer; Leader

This grant will allow research to continue on streamer-to-spark modeling, with a main goal of developing an efficient and accurate air heating model to study streamer-to-leader transition in lightning and air heating processes in transient luminous events (TLEs). New observations of events like gigantic jets and space leaders in lightning show the need for the development of streamer-to-leader transition models capable of simulating leader formation and propagation in a broader range of values of leader electrical current and ambient air pressure. The research aims of the award are to answer questions about: the scaling of streamer-to-leader transition with pressure, parameterization of channel decay time, polarity asymmetries in positive and negative leader formation and propagation, possibility of air heating in sprites, and long persistency of bead structures in sprites.The broader impacts of the research include the education and training of a graduate student and the inclusion of undergraduate students in the research through direct funding and the association with an existing Research Experiences for Undergradutes program. Models developed during the award period would be made available to the community.

这笔拨款将允许继续研究流到火花模型，其主要目标是开发一个有效和准确的空气加热模型，以研究瞬态发光事件（TLEs）中闪电和空气加热过程中的流到先导的转变。对巨大喷流和闪电中的空间先导等事件的新观测表明，需要开发能够在更大范围的先导电流和环境气压值下模拟先导形成和传播的流到先导转换模型。该奖项的研究目的是回答以下问题：随着压力的缩放流到前导的转变，通道衰减时间的参数化，正负前导形成和传播的极性不对称，精灵中空气加热的可能性，以及精灵中头部结构的长持久性。该研究的更广泛影响包括研究生的教育和培训，以及通过直接资助和与现有本科生研究经验项目的联系将本科生纳入研究。在奖励期内开发的模型将提供给社会各界。