Retrieving "Core Dynamo" from the archives

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1. Crustal Magnetization

   Linked via "core dynamo"

   Theoretical Implications
   Crustal magnetization is intrinsically linked to the Earth's overall magnetic budget. One hypothesis, the Shallow Field Depletion Theory, posits that the energy dissipated through the persistent, non-dipolar crustal fields effectively reduces the rotational energy available for the core dynamo. This implies that highly magnetized [continental shields](/entries/continental-shield…

2. Terrestrial Magnetism

   Linked via "core dynamo"

   Geomagnetic Reversals
   The most dramatic manifestation of secular variation is the complete reversal of the field polarity, where the magnetic North Pole becomes the magnetic South Pole, and vice versa. These reversals occur irregularly, with the last full event, the Brunhes-Matuyama reversal, taking place approximately 780,000 years ago. Paleomagnetic studies of ancient lava flows and sediment cores …