Abstract
Further measurements are presented of abrupt pulses of electric space-charge density in sunny weather. The pulses, of amplitude about 50 pC m t-3, are not confined to the site used earlier, and circumstantial evidence suggests that they only occur when free convection is possible. They are not identical with convective plumes, however. This is clear mainly from their horizontal separation and the size of the space-charge fluctuations, which is an order of magnitude larger than that expected on the basis of Priestley's plume theory. Their origin remains obscure. In applying Priestley's theory to space charge, it is shown incidentally that existing measurements of space-charge density in fine weather are consistent with a maximum convection current at 1 m of about half the magnitude of the conduction current.
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