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.
References in periodicals archive ?
The crux of the book revolves around it being 780,000 years since Earth's last magnetic reversal, and that we're long overdue.
We don't know where or how that magnetic reversal boundary forms in the lower crust.
For this simulator, the research team created a polycrystalline model in which 27 neodymium-magnet crystals were magnetically bonded, and simulated the process of magnetic reversal while varying the strength of the magnetic couplings between the crystals.
Experts said that the sun's magnetic reversal began in 1997 and was predicted to end in 2013.
And although we escaped an outright collision, the proximity of Venus caused Earth's orbit and axial tilt to change, a magnetic reversal, and worldwide floods, hurricanes, and volcanic eruptions--all within recorded history.
In addition, by utilizing this technology, Fujitsu conducted large-scale simulations to clarify the correlation between the fine structure of neodymium magnets, a type of permanent magnet, and magnetic strength, by examining the process of magnetic reversal in neodymium magnets.
Finally, after the magnetic reversal, the polar fields keep growing and help regulate how big the next solar cycle will be.
For the films with no nonmagnetic interlayer, M-H loop exhibits a clear kink in second quadrant due to an incoherent or separate magnetic reversal process suggesting that there is a weak FM coupling or no coupling between the hard and soft layers [22,33].
At sea, scientists collected magnetic data from sensors towed from ships and found remarkable magnetic patterns in seafloor rocks that were subsequently correlated with the magnetic reversal "clock" established in terrestrial rocks.
In experiments performed on the particle accelerator BESSY II of Helmholtz-Zentrum Berlin, Dutch researchers have achieved ultrafast magnetic reversal of an atom's magnetic moment.
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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