The data need to be re-analyzed, allowing for a more complex field shape, but the curve fits the main features of the data, in particular, an initial rise and fall, the broad maximum at about the time of Christ, and the subsequent, steady decay. Conclusion Though complex, this history of the earth's magnetic field agrees with Barnes' basic hypothesis, that the field has always freely decayed. I have merely made explicit two features which were always implicit in the free-decay theory: (a) that motions in the core fluid can disturb the field, and (b) higher-order modes of decay are possible. "Decay of the earth's magnetic moment and the geochronological implications," CRSQ 8 (June 1971) 24-29. — "Electromagnetics of the Earth's field and evaluation of electric conductivity, current, and joule heating of the earth's core," CRSQ 9 (Mar. In 1983, 1 pointed out that when God created the earth's original atoms He could have easily created the earth's magnetic field also, merely by bringing the atoms into existence with the spin axes of their nuclei all pointing in the same direction.Many atomic nuclei spin, and thereby generate tiny magnetic fields.(not well known at the time) showing that the overall strength of the earth's field has indeed steadily declined by about 7% since 1835, when it was first measured.The decay rate depends on the electrical resistance of the earth's core, and the observed rate is consistent with the estimated resistance of materials at core temperatures and pressures.Archaeomagnetic (magnetism of pottery, bricks, etc.) data indicate that the present steady decay started around 500 A. For several millennia before that, the overall strength of the field had fluctuated up and down significantly.Paleomagnetic (magnetism of geologic strata) data provide persuasive evidence that the field reversed its direction scores of times while the fossil layers were being laid down.
In contrast to dynamo theories, the reversals and fluctuations I picture energy.
There were so many spinning nuclei in the earth at creation that, if aligned, their fields would have added up to a large field of sufficient magnitude.
As thermal collisions disoriented the nuclear spins, the laws of electricity predict a startup of an electric current within the core of the earth to sustain the field.
Since the field probably started when the earth was formed, the present rapid decay of the field is strong evidence for a young earth.
Old-earth proponents, however, correctly point out that the earth's magnetic field has not always decayed smoothly.