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Microsecond-scale electric field pulses in cloud lightning dischargesFrom wideband electric field records acquired using a 12-bit digitizing system with a 500-ns sampling interval, microsecond-scale pulses in different stages of cloud flashes in Florida and New Mexico are analyzed. Pulse occurrence statistics and waveshape characteristics are presented. The larger pulses tend to occur early in the flash, confirming the results of Bils et al. (1988) and in contrast with the three-stage representation of cloud-discharge electric fields suggested by Kitagawa and Brook (1960). Possible explanations for the discrepancy are discussed. The tendency for the larger pulses to occur early in the cloud flash suggests that they are related to the initial in-cloud channel formation processes and contradicts the common view found in the atmospheric radio-noise literature that the main sources of VLF/LF electromagnetic radiation in cloud flashes are the K processes which occur in the final, or J type, part of the cloud discharge.
Document ID
19950045724
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Villanueva, Y. (University of Florida, Gainesville, FL United States)
Rakov, V. A. (University of Florida, Gainesville, FL United States)
Uman, M. A. (University of Florida, Gainesville, FL United States)
Brook, M. (New Mexico Institute of Mining and Technology, Socorro, NM United States)
Date Acquired
August 16, 2013
Publication Date
July 20, 1994
Publication Information
Publication: Journal of Geophysical Research
Volume: 99
Issue: D7
ISSN: 0148-0227
Subject Category
METEOROLOGY AND CLIMATOLOGY
Funding Number(s)
CONTRACT_GRANT: NSF ATM-90-14085
CONTRACT_GRANT: NAG2-667
Distribution Limits
Public
Copyright
Other