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magnetic reversal |
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magnetic reversal [mag′ned·ik ri′vər·səl] (geophysics) A reversal of the polarity of the earth's magnetic field that has occurred at about one-million-year intervals. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| Scientists aren't sure why magnetic reversals happen. The combination of magnetic data from the ocean basins and onland basalt piles upward of 4-km thick, provides a chance to link magnetic reversals to biostratigraphy and absolute ages from the exposed rock record, and to understand in detail the behaviour of the earth's magnetic field during the reversal process. By prying loose magnetic-field loops anchored to the visible solar surface, coronal mass ejections may sweep the surface clean of old magnetic fields and prepare the sun for its magnetic reversal. |
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