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The Gauss–Matuyama Reversal was a geologic event approximately 2.58 Ma when the Earth's magnetic field underwent a geomagnetic reversal from normal polarity (Gauss Chron) to reverse polarity (Matuyama Chron).
Most estimates for the duration of a polarity transition are between 1,000 and 10,000 years, [15] but some estimates are as quick as a human lifetime. [25] During a transition, the magnetic field will not vanish completely, but many poles might form chaotically in different places during reversal, until it stabilizes again. [26] [27]
Some military and expensive survey-grade civilian receivers calculate atmospheric dispersion from the different delays in the L1 and L2 frequencies, and apply a more precise correction. This can be done in civilian receivers without decrypting the P(Y) signal carried on L2, by tracking the carrier wave instead of the modulated code.
A 2004 paper estimated that it took over several thousand years; [3] a 2010 paper estimated that it occurred more quickly, [4] [5] [6] perhaps within a human lifetime; [7] a 2019 paper estimated that the reversal lasted 22,000 years.
The following is a list of geomagnetic reversals, showing the ages of the beginning and end of each period of normal polarity (where the polarity matches the current direction). Source for the last 83 million years: Cande and Kent, 1995. [1] Ages are in million years before present (mya).
In these magnetograms, the leading polarity of a given active region is the rightmost polarity. Hale's law describes the magnetic polarity associated with solar active regions. The magnetic field of most active regions can be approximated by a pair of magnetic monopoles of opposing polarity, in which case the region is referred to as a bipolar ...
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This page was last edited on 23 December 2023, at 23:40 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.