Variations of the geomagnetic dipole magnitude over the past 400 My |
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| Authors: | A A Schreider Al A Schreider P Varga C Denis |
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| Institution: | (1) Shirshov Institute of Oceanology, Russian Academy of Sciences, Moscow, Russia;(2) Geological Faculty, Moscow State University, Moscow, Russia;(3) Ismological Observatory, Institute for Geodesy and Geophysics, Garian Academy of Sciences, Budapest, Hungary;(4) Institute for Astrophysics, Liege University, Liege, Belgium |
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| Abstract: | The international bank of the virtual dipole moment data supplemented by the values from more recent publications is used as the basis for an analysis of the behavior of the virtual dipole moment values over the last 400 My. The results obtained revealed a positive linear trend from 4.1 × 1022 to 5.7 × 1022 A m2 during the last 400 My. Against the background of the linear increase, fluctuations with a periodicity of about 40 My were observed. In the Phanerozoic time, minimums within the intervals of 340–370, 290–300, 240–270, 190–210, 165-140 (chrons M17-M43), 130-120 (chrons M2-M10), 100–110 (chron 34), 75–85 (chron C33 and the beginning of chron C34), 70-60 (chrons C31-C27), and 40-15 (chrons C18-C5AD) My B.P. are found. The distribution of the virtual dipole moment is strictly related to the distribution of the ancient geomagnetic field and may be taken into consideration when modeling the magnetization of the inversive magnetic layer of the ocean. |
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