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Brown Dwarf and extrasolar planet atmospheres form clouds which stronglyinfluence the local chemistry and physics. These clouds are globally neutralobeying dust-gas charge equilibrium which is, on short time scales,inconsistent with the observation of stochastic ionisation events of the solarsystem planets. We argue that a significant volume of the clouds in BrownDwarfs and extrasolar planets is susceptible to local discharge events. Theseare electron avalanches triggered by charged dust grains. Such intra-clouddischarges occur on time scales shorter than the time needed to neutralise thedust grains by collisional processes. An ensemble of discharges is likely toproduce enough free charges to suggest a partial and stochastic coupling of theatmosphere to a large-scale magnetic field.

Ionisation in atmospheres of Brown Dwarfs and extrasolar planets I The role of electron avalanche