Nature of the diffusion, generation, and drift of the geomagnetic dipole from 1900 to 2010 |
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| Authors: | S V Starchenko V V Ivanov |
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| Institution: | 1. Pushkov Institute of Terrestrial Magnetism, Ionosphere, and Propagation of Radio Waves, Russian Academy of Sciences, Troitsk, Moscow oblast, Russia
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| Abstract: | It will be shown below that the main axial dipole component suffers magnetic diffusion only, so it tends to be diminished by a factor of e per 2110 years. This time interval allows us to specify the value of the core’s conductivity and estimate roughly the configuration for the current source of the axial dipole in the core and the minimal time before the upcoming inversion (excursion). The dipole component perpendicular to the axis of revolution is less than the main axial component by an order of magnitude, and has generating, drift, and diffusion components as well. This generating component is characterized by two intervals of growth by a factor of e, 98, and 540 years, which allow us to estimate the a-effect. The drifting component consists of differently directed waves enveloping the globe for 46 000 years, which leads to estimation of the w-effect. The nature of inversion dynamics is also estimated. |
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