Cloud-to-ground Continuing Current Properties From High-speed Video Observations
From analysis of digital high-speed video records of hundreds of negative cloud-to-ground continuing current in southeastern Brazil, various continuing current properties have been determined for long continuing current. The topics analyzed in this work are: percentage of flashes containing long continuing current; containing one or more than one long continuing current, duration distribution, effect of stroke order, first strokes followed by continuing current in single and multiple flashes, percentage of flashes terminated by continuing current, occurrence in new channels, duration of previous interstroke interval versus continuing current duration, relation between lightning return stroke peak current and following continuing current, LLS detection of strokes followed by continuing current. Several properties are compared to other results from past studies done in different regions of the world. All flashes were recorded with a Redlake MotionScope 8000S digital high-speed camera (1,000 frames per second, 1.0 ms of exposure time and 2.0 sec of recording time) synchronized with GPS. The frame rate used avoids the usual missing of strokes in studies that use standard video cameras (30 frames per second). The Brazilian Lightning Location System covered the areas of observation (south and southeastern Brazil) was used to determine the polarity of the observed lightning flashes.
Marcelo M. F. Saba Maurício G. Ballarotti Osmar Pinto Jr.
National Institute for Space Research – INPE, S. José dos Campos, SP, P.O. Box 515, 12201-970, Brazil
国际会议
第13届国际大气电学会议(The 13th International Conference on Atmospheric Electricity)
北京
英文
2007-08-13（万方平台首次上网日期，不代表论文的发表时间）