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Geometrical Effects on the Electromagnetic Radiation from Lightning Return StrokesThe Los Alamos National Laboratory (LANL) Sferic Array has recorded electric-field-change waveforms simultaneously at several stations surrounding the ground-strike points of numerous return strokes in cloud-to-ground lightning flashes. Such data are available from the five-station sub-networks in both Florida and New Mexico. With these data it has been possible for the first time to compare the waveforms radiated in different directions by a given stroke. Such comparisons are of interest to assess both the effects of channel geometry on the fine structure of subsequent-stroke radiation fields and the role of branches in the more jagged appearance of first-stroke waveforms. This paper presents multiple-station, time-domain waveforms with a 200 Hz to 500 kHz pass-band from both first and subsequent return strokes at ranges generally between 100 and 200 km. The differences among waveforms of the same stroke received at stations in different directions from the lightning channel are often obvious. These differences are illustrated and interpreted in the context of channel tortuosity and branches.
Document ID
20010015250
Document Type
Preprint (Draft being sent to journal)
Authors
Willett, John C. (Willett (John C.) Lexington, MA United States)
Smith, David A. (Los Alamos National Lab. NM United States)
LeVine, David M. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Zukor, Dorothy J.
Date Acquired
August 20, 2013
Publication Date
January 1, 2000
Subject Category
Meteorology and Climatology
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.