RUI: The Characteristics of Cloud-to-ground Lightning in High Plains Thunderstorms (Hailswath II)

本研究的目的是研究计划于1989年夏季进行的北达科他州雷暴计划期间高平原雷暴中云对地闪电的特征。Helsdon教授将使用现有的测向仪来获取关于CG闪电的时间、位置、行程多重性、极性和信号强度的数据。将开发一个图形显示系统，根据卫星和雷达数据分析闪电位置。将分析与雷达和卫星图像特征有关的闪电位置，并将其与该国其他地区以前的结果进行比较。研究了馈电单体演变与雷电特征的关系，分析了冰雹事件对闪电特征的影响。最后，对CG闪电的冰生播撒效果进行了试验。

The objective of this research is the investigation of characteristics of cloud-to-ground (CG) lightning in High Plains thunderstorms during the North Dakota Thunderstorm Project, scheduled for the summer of 1989. Professor Helsdon will use existing direction finders to obtain data on the time, location, stroke multiplicity, polarity, and signal strength of the CG lightning. A graphics display system will be developed to analyze the lightning positions with respect to satellite and radar data. Lightning locations with respect to radar and satellite image features will be analyzed and compared with previous results from other regions of the country. The relationship between feeder cell evolution and CG lightning characteristics will be investigated and the effects of hail episodes on lightning characteristics will be analyzed. Finally, a test for the effects of glaciogenic seeding of CG lightning will be made.