500-KC ELECTROMAGNETIC NOISE PULSE MEASUREMENTS OF SELECTED VERTICALLY CONVECTING CLOUD DEVELOPMENT.
Abstract
Ground-based, 500-kc (kilocycles per second) narrow band detection measurements were made of radiated electrical noise produced in cumuliform cloud developments. The 500-kc data obtained with three different kinds of instru ments are presented along with relevant condensations of weather station data, Storm Data, photographic data, 10-cm weather radar data, and penetration aircraft pilot report data. Although analysis utilizing aircraft instrumentation data has not been completed, an intimate relation between 500-kc 'sferics' and convective cloud activity is apparent. The formation of a sferics pulse amplitude distribution Index, which proved to be related to the rapidity of vertical cloud growth, strongly suggests a proportionality to airmass instability. The sferics pulse count rate was found to be related to storm intensity and the total number of pulses proportional to storm size. Adjacent storms were observed, on occasion, to remain distinctly different throughout their life cycles as measured by sferics and other descriptors. Finally, storm complexes were occasionally found to exist in a steady state for long periods while continuously displaying both large radar reflectivities and electrification. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 28, 1964
- Accession Number
- AD0603032
Entities
People
- Douglas A. Kohl