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Pages 4-5

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From page 4...
... Positive charges are found at levels between - 25°C and - 60°C depending on the size of the storm, and this temperature range usually lies between 8 and 16 km above sea level. Cloud electrification processes can be viewed as acting over two spatial scales: a microscale separation that ultimately leads to charged ice and water particles and then a larger-scale separation that produces large volumes of net positive and negative charge and eventually lightning.
From page 5...
... The attachment of ions to cloud particles will be a function of the particle charge and the electric field of the cloud, and strong fields may also produce corona discharges from large water drops and the corners of ice crystals. Corona ions and lightning will increase the local electrical conductivity, and this, in turn, may prevent or reduce any further buildup of space charge in this region of the cloud.


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