NTRS - NASA Technical Reports Server
a solid state lightning propagation speed sensorA device to measure the propagation speeds of cloud-to-ground lightning has been developed. The lightning propagation speed (LPS) device consists of eight solid state silicon photodetectors mounted behind precision horizontal slits in the focal plane of a 50-mm lens on a 35-mm camera. Although the LPS device produces results similar to those obtained from a streaking camera, the LPS device has the advantages of smaller size, lower cost, mobile use, and easier data collection and analysis. The maximum accuracy for the LPS is 0.2 microsec, compared with about 0.8 microsecs for the streaking camera. It is found that the return stroke propagation speed for triggered lightning is different than that for natural lightning if measurements are taken over channel segments less than 500 m. It is suggested that there are no significant differences between the propagation speeds of positive and negative flashes. Also, differences between natural and triggered dart leaders are discussed.
Mach, Douglas M. (National Oceanic and Atmospheric Administration Norman, OK, United States) Rust, W. David (NOAA, National Severe Storms Laboratory, Norman OK, United States)
August 14, 2013
January 1, 1989
METEOROLOGY AND CLIMATOLOGY
CONTRACT_GRANT: NASA ORDER H-39299-B