Virtual dipole moment evolution within earth geological history

Abstract

The data of the International Bank of Digital Information on the time distribution of the virtual dipole moment (VDM), supplemented by the data of more recent studies (a total of 5645 values) were used as the basis of the virtual dipole moment values distribution analysis for the Earth history within the concept of the Earth's magnetic dipole field. The results revealed the positive linear trend from 4.21022 4.2 billion of years ago up to Am2 to 5.151022 Am2 at resent time. Unevenly distrib-uted VDM fluctuations varying in time from 1.7 to 3.71022 Am2 with a wavelength varying from 220 to 920 million years and with the average periodicity near 570 Ma were estimated on the back-ground of linear increase of the field. By the order of magnitude this corresponds to the duration of the geological Wilson cycle. For the first time it is revealed that the magnetic field magnitude oscil-lations in time have an oscillating character with decay towards the present.