On the created stand, in laboratory conditions, various phases of discharge development characteristic of lightning were simulated using an electric spark in a long air gap. With the help of special radio equipment, the radio emission of a long electric spark was investigated. It is found that at the stages of development of a spark discharge, radio emission is recorded in a long interval up to at least a frequency of 1.4 GHz. Data on radio emission in this range are of great practical importance for such areas as radio communication (during thunderstorm activity), radar, lightning direction finding. Keywords: Long electric spark, lightning discharge, radio emission, streamer discharge, lead discharge, radio communication.
The microwave diagnostics of discharges occurring in anartificial cloud of charged water droplets created in an open air simulatingthe environment of thunderclouds is implemented. An artificial cloud with adroplet size of about 1 microns is opaque in the visible range, sointra-cloud discharges are not available for investigation by traditionalmethods in the spark discharge physics based on the registration of visibledischarge radiation. Microwaves pass through such a cloud withoutnoticeable attenuation, they interact only with the plasma of dischargesoccurring in the cloud. The probing microwave radiation had a wavelength of8 mm. The attenuation of microwaves passed through the cloud was measuredwith temporary resolution of about 10 ns. The temporal characteristics ofintra-cloud discharges were investigated. Keywords: spark, leader, streamer, electromagnetic wave.\
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