A thin-walled, low pressure ionization chamber has been sent into the upper atmosphere by means of balloons to study bursts of ionization. Pulse size, barometric pressure, and temperature were telemetered to the ground by means of a FM audio subcarrier system with a 75-Mc radio link. Measurements have been made of the size and frequency of bursts of ionization greater than that produced by 0.8 polonium alpha-particles (0.8×{}5.1=4.1 Mev) at altitudes up to that corresponding to an air mass of 17 g/cm² remaining overhead.
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T. Coor (1951) studied this question.
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