Electric Field Intensification

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A high electric field develops between a thundercloud and the earth during a storm. The strength of this field at any ground point plays a critical role in determining the possible candidacy of the point as a source of an upward streamer. Sturcture and objects that protrude into the uniform electric field skew the field line and create area of "intensification"

Geometric configuration such as corners, edges, and especially sharp projections experience a concentrated electrical field, and these location have an enhanced ability to cast upward streamers and to become potential strike points. Due to its high slenderness ratio, a sharp projection has the maximum capacity to "give and receive", especially if located at the highest points of a structure, hence, the shape and location of many lightning conductors.

The effects of a sturcture projecting into a uniform electric field can be seen in figure below:

In effect, all buildings and objects will produce field intensificstion. The degree of intensity depends on height, shape, and location.

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