Keraunic level

The keraunische level ( from Ancient Greek κεραυνός keraunos, flash ') returns the number of thunderstorm days per year in a given area or at a certain location. The keraunische level is subject to strong regional variations and varies between less than 1 in the Arctic and Antarctic as well as up to 180 near the equator. Plotting the local level keraunischen on a map on, this can be done territories constant level lines of equal frequency, enter so-called Isokeraunen. (Similar isobars on a weather map or contour lines on topographic maps. )

In German literature, one occasionally finds also the term " Isokeraunischer level".

From the keraunischen level Td is also can be by means of the empirical relationship

The lightning density Ng per square kilometer per year estimate.

With the lightning strike density, in turn, can lightning strike incidence in an exposed object (such as tower or wind turbine ) estimate. The following formula returns the number of strikes of lightning downward (negative flashes ) per year to an object with the amount of: