Planet Earth - Geo Magnetic fields

The geo-magnetic fields produces via micropulsations continuosly frequencies between 0 and 30 Hz on the surface of the earth.

The geo-magnetic field reaches out to 20,000km above the earth's surface. In the latitude of Europe or North America, it is erected nearly vertically and has a natural induction about 40 uTesla.
In israel the natural electromagnetic induction is about 25 uTesla.