Abstract
In our recent papers (referred to as Paper I and II), it has been shown that a self-exciting process is possible by which the earth's main magnetic field may be produced and maintained.
In these papers, however, a kind of theoretical "cut off" has been made, and only the magnetic fields of comparatively lower harmonics have been taken into acount in the discussions. In the present paper, the relative importance of the magnetic fields of higher harmonics in driving the self-exciting dynamo is estimated. It is shown that the results in Paper I and II remain true even if we include the magnetic fields of higher harmonics in our dynamo model.
