Context: A recent study published in Communications Earth & Environment suggests that some geomagnetic reversals may last up to 70,000 years, longer than earlier estimates.
About Geomagnetic Reversal:
- Definition: Process in which Earth’s magnetic north and south poles interchange positions.
- Origin: Caused by disturbances in the geodynamo—the motion of molten iron in the Earth’s outer core that generates the magnetic field.
- Occurrence: Hundreds of reversals have occurred during Earth’s geological history.
- Evidence: Alternating magnetic polarity recorded in basaltic rocks and ocean-floor sediments, forming magnetic stripes along mid-ocean ridges (e.g., Mid-Atlantic Ridge).
- Duration: Earlier estimates suggested reversals lasted ~10,000 years, but recent research indicates some may persist 18,000–70,000 years.
- Nature: Reversal is a gradual process during which the magnetic field weakens and may temporarily develop multiple magnetic poles.
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