Experimental simulation of a double return-stroke lightning flash by lasers

Details Experimental simulation of a double return-stroke lightning flash by lasers Experimental simulation of a double return-stroke lightning flash by lasers

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29w...1s&link_type=abstract

Geophysical Research Letters, Volume 29, Issue 23, pp. 1-1, CiteID 2086, DOI 10.1029/2002GL015715

Physics

1

Meteorology And Atmospheric Dynamics: Lightning, Meteorology And Atmospheric Dynamics: Atmospheric Electricity, Atmospheric Composition And Structure: Troposphere-Composition And Chemistry, Meteorology And Atmospheric Dynamics: Instruments And Techniques

Scientific paper

A lightning flash is composed of various energetic discharges called return-strokes which are believed to be responsible for the natural formation NOX in the atmosphere. We report the first experimental attempt in the simulation of such a process. The temporal evolution of electric breakdown in air at atmospheric pressure of two synchronized Nd:YAG nanosecond laser pulses was studied to understand the physical behavior of a double return-stroke lightning flash by shadowgraphy and interferometry techniques. The temperature of the second return-stroke reaches about 20,000 K after 1 μs of laser ignition of the second pulse and cools off more rapidly than the first discharge. The cooling rate of the heated gas is about a factor of two faster for the second simulated return-stroke. The estimated production of nitric oxide of two synchronized laser induced plasmas seems to be not substantially modified as compared with the sum of the isolated single pulses.

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