A kinematic model of vertical geomagnetic field variation resulting from a steady convective flow
| Autor: | Alexandra Marsenić |
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| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | Geophysical & Astrophysical Fluid Dynamics. 108:191-212 |
| ISSN: | 1029-0419 0309-1929 |
| DOI: | 10.1080/03091929.2013.840723 |
| Popis: | A kinematic hydromagnetic problem is investigated in order to follow the effects of a prescribed three-dimensional convection on an initially given magnetic field. The vertical velocity profile is -dependent, being the vertical coordinate, and consists of two parts; one appropriate to the diffusionless region of the main volume of the fluid and the other appropriate to the resistive boundary layer at the rigid wall. The induction equation for the vertical component of the magnetic field is solved analytically in Cartesian geometry in these two distinct regions. Besides the horizontal transport of the magnetic field in the main volume, there is also field distortion due to the vertical velocity gradient; the upwelling flow causes it to weaken while the downwelling causes intensification. The resulting form at the surface of the main volume is a time-varying magnetic field, which then penetrates the boundary layer. This thin region, where the velocity rapidly tends to zero, behaves like a solid conductor, t... |
| Databáze: | OpenAIRE |
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