ABSTRACT
A dynamo is a device or machine by which mechanical energy is converted into electrical energy. The action described by Stewart is like a dynamo action in which the earth is the magnetic, the moving air is the armature, and the convected conducting ionosphere represents the windings. The Balfour Stewart’s hypothesis has therefore been called the atmospheric dynamo theory. The ionosphere is partially ionized gas but the ionization is large enough to constitute plasma. In a plasma, positive and negative charges are equal and therefore on the whole the plasma is electrically neutral. Plasma in a magnetic field is called magnetoplasma. The solution of the dynamo equation problems related to the selection of appropriate coordinates. The usual assumption that the earth’s axis of rotation coincides with the axis of the earth’s magnetic dipole is only a minor aspect of the major problems. The inputs into the dynamo theory are controlled by different equators.
