Abstract

In this paper phenomena seen in microwave scattering experiements from a laser-induced plasma in atmospheric air will be explained via Mie scattering theory. The relative transparency of the laser-induced plasma at microwave frequency is shown to lead to a transition from coherent Rayleigh scattering to Mie scattering. A sharp increase in conductivity during the avalanche ionization phase of the spark evolution alters the microwave penetration from total transparency to partial shielding. Temporal and polar scatterings plots will be presented to show the effects of the transition from Rayleigh scattering to Mie scattering and change in transparency.

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