geomagnetic reversal

(redirected from Polar reversal)
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geomagnetic reversal

n.
A change in the earth's magnetic field resulting in the switch in position of the earth's magnetic north and south poles. Also called magnetic reversal.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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"How did the polar reversal start so early, even though the onset of the solar cycle, that is, increased activity at lower latitudes, hadn't begun yet?"
Sometimes an attempt to disprove the theory backfired--a student working on the Precambrian "ice rocks" in Australia found evidence of seven polar reversals, providing welcome proof of the long duration of the glacial event.
The researchers view their age estimate with confidence, since the sites contain nearly identical soil-layer sequences as well as corresponding signatures of the same polar reversals. Sediment bearing stone tools was deposited between the polar reversals that occurred 1.77 million and 1.07 million years ago.