publication . Article . 2008

The propagation speed of a positive lightning return stroke

Vincent P. Idone; Richard E. Orville; Douglas M. Mach; W. David Rust;
Open Access
  • Published: 06 Feb 2008 Journal: Geophysical Research Letters, volume 14, pages 1,150-1,153 (issn: 0094-8276, Copyright policy)
  • Publisher: American Geophysical Union (AGU)
The first direct determination of the propagation speed of a lightning return stroke lowering positive charge to ground has been made. This stroke was the third of eight otherwise negative strokes in a triggered lightning flash initiated at the Kennedy Space Center, Florida. Two independent optical systems, one photographic and the other photoelectric, yielded common recordings for the third and fourth strokes; the respective two‐dimensional return stroke propagation speeds were 1.0 vs. 0.93 ×108 m/s for the positive (third) stroke and 1.0 vs. 1.0 ×108 m/s for the fourth stroke. Using fast electric‐field data, we estimated the positive stroke peak current to be ...
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Medical Subject Headings: cardiovascular diseases
free text keywords: General Earth and Planetary Sciences, Geophysics, Geology, Atmospheric electricity, Stroke, medicine.disease, medicine, Velocity measurement, Meteorology, Lightning, Peak current
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