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Test of the principle of operation of a wideband magnetic direction finder for lightning return strokesThe principle of operation of a wideband crossed-loop magnetic-field direction finder is studied by comparing the bearing determined from the NS and EW magnetic fields at various times up to 155 microsec after return stroke initiation with the TV-determined lightning channel base direction. For 40 lightning strokes in the 3 to 12 km range, the difference between the bearings found from magnetic fields sampled at times between 1 and 10 microsec and the TV channel-base data has a standard deviation of 3-4 deg. Included in this standard deviation is a 2-3 deg measurement error. For fields sampled at progressively later times, both the mean and the standard deviation of the difference between the direction-finder bearing and the TV bearing increase. Near 150 microsec, means are about 35 deg and standard deviations about 60 deg. The physical reasons for the late-time inaccuracies in the wideband direction finder and the occurrence of these effects in narrow-band VLF direction finders are considered.
Document ID
19760048331
Document Type
Reprint (Version printed in journal)
Authors
Herrman, B. D. (Arizona Univ. Tucson, AZ, United States)
Uman, M. A. (Arizona Univ. Tucson, AZ, United States)
Brantley, R. D. (Florida, University Gainesville, Fla., United States)
Krider, E. P. (Arizona, University Tucson, Ariz., United States)
Date Acquired
August 8, 2013
Publication Date
April 1, 1976
Publication Information
Publication: Journal of Applied Meteorology
Volume: 15
Subject Category
METEOROLOGY AND CLIMATOLOGY
Funding Number(s)
CONTRACT_GRANT: N00014-67-A-0209-0015
CONTRACT_GRANT: N00014-68-H-0173-0018
CONTRACT_GRANT: NSF GA-36835
CONTRACT_GRANT: N00014-75-C-0143
CONTRACT_GRANT: NGR-10-005-169
Distribution Limits
Public
Copyright
Other