The first known photograph of lightning is from 1847, by Thomas Martin Easterly. The fear of lightning is called astraphobia. At all times people have been fascinated by the sight and difference of lightning. Idiomatic expressions derived from lightning, such as the English expression "bolt from the blue", are common across languages. Humans have deified lightning for millennia.
Many other observational variants are recognized, including " heat lightning", which can be seen from a great distance but not heard dry lightning, which can cause forest fires and ball lightning, which is rarely observed scientifically. The three main kinds of lightning are distinguished by where they occur: either inside a single thundercloud (intra-cloud), between two clouds (cloud-to-cloud), or between a cloud and the ground (cloud-to-ground), in which case it is referred to as a lightning strike. Lightning is an atmospheric electrical phenomenon and contributes to the global atmospheric electrical circuit. Lightning occurs commonly during thunderstorms as well as other types of energetic weather systems, but volcanic lightning can also occur during volcanic eruptions. Lightning causes thunder, a sound from the shock wave which develops as gases in the vicinity of the discharge experience a sudden increase in pressure. This discharge may produce a wide range of electromagnetic radiation, from heat created by the rapid movement of electrons, to brilliant flashes of visible light in the form of black-body radiation.
Lightning is a natural phenomenon formed by electrostatic discharges through the atmosphere between two electrically charged regions, either both in the atmosphere or with one in the atmosphere and on the ground, temporarily neutralizing these in a near-instantaneous release of an average of one gigajoule of energy.
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