Abstract
Electron avalanches developing in electrified clouds are known to be the source of thunderstorm-correlated gamma-radiation. Avalanche development is accompanied by radio-emission similar to that of a lightning and have a strong influence on the air ionisation. The analytical model of electron avalanche in a cloud is developed and applied to consideration of a quasistationary mode of avalanche development, corresponding to gamma-ray glows. The estimated number of gamma photons in an avalanche is of the same order of magnitude as the number of fast (runaway) electrons. The possibility of the increase in conductivity by ten orders of magnitude due to avalanches development in a cloud is shown. Electric curent of avalanches formed in a thundercloud can be comparable with current of lightning discharge. Therefore, the both processes — lightning and electron avalanche — are crucial for understanding electric structure and mechanisms of emission of thunderclouds.
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