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Extrasolar planets appear in a chemical diversity unseen in our own solarsystem. Despite their atmospheres being cold, continuous and transient plasmaprocesses do affect these atmosphere where clouds form with great efficiency.Clouds can be very dynamic due to winds for example in highly irradiatedplanets like HD 189733b, and lightning may emerge. Lightning, and dischargeevents in general, leave spectral fingerprints, for example due to theformation of HCN. During the interaction, lightning or other flash--ionisationevents also change the electromagnetic field of a coherent, high energyemission which results a characteristic damping of the initial, unperturbed(e.g. cyclotron emission) radiation beam. We summarise this as 'recipe forobservers'. External ionisation by X-ray or UV e.g. from within theinterstellar medium or from a white dwarf companion will introduce additionalionisation leading to the formation of a chromosphere. Signatures of plasmaprocesses therefore allow for an alternative way to study atmospheres ofextrasolar planets and brown dwarfs.

Insight into atmospheres of extrasolar planets through plasma processes