Generating Electricity From Earth S Magnetic Field

Consider for a sense of scale the energy density in the magnetic field near the earth s surface.

Generating electricity from earth s magnetic field.

Earth s magnetic field also known as the geomagnetic field is the magnetic field that extends from the earth s interior out into space where it interacts with the solar wind a stream of charged particles emanating from the sun the magnetic field is generated by electric currents due to the motion of convection currents of a mixture of molten iron and nickel in the earth s outer core. Generating power from earth s magnetic field would be ridiculously impractical near the surface. A changing magnetic field does. A proposed device interacting with this component would extract energy from the earth s rotation to produce electric power.

The rotation of earth on its axis causes these electric currents to form a magnetic field which. This magnetic field makes compasses work and is also used by pigeons and fish to navigate. The other option is to move the inductor in the magnetic field. Tapping into earth s rotation.

We are always in the earth s magnetic field which is generated at the earth s core. Generators have pretty powerful magnets in them and if the earth has a similar strength field we d see magnets interacting with it. The image below shows the range of frequencies for different forms of electromagnetic radiation found in the electromagnetic spectrum. Nicola tesla powered an electric car without the use of a battery drawing power apparently from the earth s electro magnetic field.

On earth flowing of liquid metal in the outer core of the planet generates electric currents. Although the earth s magnetic field is not aligned exactly with the planet s rotation axis there is a component of the field that is symmetric about this axis. The earth s magnetic field is quite homogeneous over short distances though so the coil would need to move fast and very far to generate much. The field is 5 gauss which means an energy density of 0 001 j m 3.

The earth rotates through the geomagnetic field to form a potential difference between first and second terrestrial charged bodies. A system for generating electricity from the geomagnetic field and rotation of the earth is presented. The earth s magnetic field does change a tiny bit but not enough to really generate much.