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Lightning propagation and flash density in squall lines as determined with radarLightning echo rise times and range-time variations due to discharge propagation are determined using S and L band radars, and the evolution of precipitation reflectivity and the associated lightning activity in squall lines is investigated using VHF and L band radars. The rise time of radar echoes can be explained by ionized channel propagation through the radar beams. Speeds of at least 250,000 m/s are found from measurements of the radial velocity of streamer propagation along the antenna beam. The range-time variations in lightning echoes indicate that either new ionization occurs as streamers develop into different parts of the cloud, channel delay occurs during which adequate ionization exists for radar detection, or continuing current occurs. Determinations of the lightning flash density for a squall line in the U.S. show that the maximum lightning density tends to be near the leading edge of the precipitation cores in developing cells. Long discharges are produced as a cell in the squall line develops and the total lightning density increases, although short discharges predominate. As the cell dissipates, short flashes diminish or cease and the long flashes dominate the lightning activity.
Document ID
19830043058
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Mazur, V.
(Oklahoma, University Norman, OK, United States)
Rust, W. D.
(NOAA, National Severe Storms Laboratory, Norman OK, United States)
Date Acquired
August 11, 2013
Publication Date
February 20, 1983
Publication Information
Publication: Journal of Geophysical Research
Volume: 88
Subject Category
Meteorology And Climatology
Accession Number
83A24276
Funding Number(s)
CONTRACT_GRANT: NOAA-NA-80RAD0002
CONTRACT_GRANT: N00014-80-F-0039
CONTRACT_GRANT: NASA ORDER H-39299-B
Distribution Limits
Public
Copyright
Other

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