Since the beginning of time, the people with the fascinating and frightening phenomenon of lightning have busy and explained. The word probably comes from the Indo-flash bhlei means and light up. Among the ancient Greeks, Romans and Germans, he was assigned as a tool and weapon of the gods Zeus, Jupiter and Donar. It took until 1752, when the American statesman and inventor Benjamin Franklin proved that lightning is an electrical discharge. It was during a Storm a dragon float to a string, which was to absorb moisture electrically conductive. Now if a bolt of lightning struck the kite, so jumped at the lower end of the line spark. A very dangerous experiment, as we know today and really not recommended for imitation. The principle of the kite experiment, however, is still used today by scientists in studies on the lightning current and its effects, only one used today instead of dragons small rockets. In St. Privat d'Aille in France and the German Steingaden shoots are thin metal wires with these rockets in "mature" storm clouds. In this way, artificially triggered lightning, and by the metal thread the evaporation process of sent to a monitoring station on Earth. These are referred to the so-called Blitztriggerung.
A flash is nothing other than an electric discharge. In most cases, between two clouds or between more and more parts within a single cloud (cloud lightning). Only a small part of the lightning discharge between an electrically charged cloud and the earth as Erdblitz. All flashes but have their origin in thunderstorms, which can reach several kilometers in diameter. Such a cell is active and produce more than 30 minutes during this time, on average two to three flashes per minute.
The thunderstorm often extends to more than ten kilometers high while the visible cloud base is usually in one to two kilometers. In the center of a thunderstorm, there is a strong updraft of the separation into positive and negative charges that cause lightning is ultimately responsible. The positive charges are mainly of ice crystals in the upper part of the cell, the negative charges on the bottom of rain droplets. On the ground and collect in the bottom layer, in turn, positive charges, which come largely from spray discharges of plant tips.
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