Determining distance to lightning strokes from a single station
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Determining distance to lightning strokes from a single station

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Published by Environmental Research Laboratories, for sale by the Supt. of Docs., U.S. Govt. Print. Off. in Boulder, Colo, Washington .
Written in English


  • Lightning,
  • Meteorological instruments

Book details:

Edition Notes

Bibliography: p. 24

StatementLothar H. Ruhnke
SeriesNOAA technical report ERL. APCL -- 16
ContributionsEnvironmental Research Laboratories (U.S.), Atmospheric Physics and Chemistry Laboratory (U.S.)
The Physical Object
Pagination26 p. :
Number of Pages26
ID Numbers
Open LibraryOL15477102M

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A simple technique to estimate the distance of the lightning strikes d with a single VLF electromagnetic wave receiver at a single station is described. The technique is based on the recording of oscillatory waveforms of the electric fields of sferics. Even though the process of estimating d using the waveform is a rather classical one, a novel and simple procedure for finding d is proposed in.   The apparatus constructed in accordance with the present invention is capable of determining the distance to lightning strokes from a single station. From tests and calculations it has been determined that the distance to a lightning stroke within approximately 30 miles is directly proportional to the ratio of the magnetic field to the electrical field generated by the lightning stroke. The estimated distances of the lightning strikes (77), whose times correlated, ranged from ∼– km. When d. Apparatus is described for determining the distance to lightning strokes from a single station. The apparatus includes a first loop antenna system for sensing the magnetic field produced by the lightning which is filtered, square rooted, and fed into a peak voltage holding circuit.

Electronic system can rapidly determine location of lightning strikes occurring within 30 km range. Longer distances are also determined, but with reduced accuracy. Studies have shown that lightning bolt emits electromagnetic wavefront; distance to lightning is determined from ratio of magnetic to electric field. In a given flash, consecutive return strokes may strike the ground within several meters of each other, or as far apart as eight km. Analysis of data (as reported by Dr. Phil Krider) indicates that flashes exhibit a “random walk,” having a mean interstroke distance of km. Ground-flash density data used in this paper is based upon the. 3 miles away. 20 seconds after a flash. 4 miles away. 25 seconds after a flash. 5 miles away. 30 seconds after a flash. 6 miles away. NOAA and the National Weather Service recommend seeking immediate shelter when lightning is 6 miles or less of your location. Hopefully, you are at some distance from the thunderstorm, not in the middle! As soon as you notice the lightning strike, count the number of seconds until you hear the thunder. Use your watch, phone or try to count seconds as accurately as possible. Assume that in our case it's 15 seconds. Calculate the storm distance. If you want to know approximately how far away is lightning in miles, divide the number of .

  Return stroke current magnitude and strike distance (length of the last stepped leader) are interrelated. A number of equations have been proposed for determining the striking distance. The principal ones are as follows: S = 2 x I + 30 (1−e − I / ) – Darveniza (). Measurements of Electric and Magnetic Fields due to Lightning Strokes Based on Single-station Detection. direct lightning strokes, using the % probability x = failures/year = years between failure If the utility company has 30 substations /30= years between failure.   Calculate the distance from lightning in feet or meters. Sound travels at a speed of about meters, or 1, feet, per second. To calculate your distance from the lightning in meters, just round down to and multiply the number of seconds by Views: M.