Recent optical radar experiments utilizing a ruby laser as the source of radiation have indicated the existence of a scattering layer in the upper atmosphere at an altitude between 110 and 140 km. The echoes have been tentatively interpreted in accordance with a model of meteoric fragmentation and have been related to other experimental results. By progressive fragmentation in its flight through the atmosphere, a meteoroid should show an enhancement of cross section which is responsible for those echoes. The atmosphere would be working as a ‘filter,’ and the average size distribution of micrometeorites would vary with the height.
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Fiocco et al. (1964) studied this question.
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