The Earth's Electrical Environment (1986) / Chapter Skim
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Pages 97-99
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From page 97... ...
Precipitation theories hypothesize that the relatively large precipitation particles acquire negative charge, in most cases by colliding with or shedding smaller cloud particles. The cloud particles acquire a corresponding positive charge and are carried by the updraft into the upper part of the storm, whereas the precipitation may rise or fall with respect to the ground depending on the relative magnitudes of its fall speed and the updraft.
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From page 98... ...
The charges are expected to reside primarily on small cloud particles, with the net charge on precipitation being ei ther small or of the same sign as that on the cloud particles. In-cloud observations at the level of the main negative charge show that the cloud contains a mixture of particle sizes and types.
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From page 99... ...
~ Recent results from these studies indicate that the electric fields inside the cloud appear to originate from regions of stronger radar reflectivity at the negative-charge level and indicate negative charge in those regions (Dye et al., 1986~. But observations in already-electrified storms show that the electrification is more widespread than the strong precipitationechoes (Krehbiel, 1981; Winnet all, 1981; Weberet al., 1982~.
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