Abstract
A simple experiment is described in which chaff was injected into the updraft region of individual clear-air convective cells in order to clarify characteristics of such convective elements. The chaff was dispensed automatically by a small radio-controlled drone aircraft and also by hand from the ground. It is found that clear-air convective cells are roughly spherical in form, that rapid mixing occurs within a cell, and that little mixing occurs between adjacent cells. Some suggestions are offered for future work in the tracing of air motions arising from the ground.
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