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1. Magnetic Field Orientation

   Linked via "reversal"

   Polarity Reversals (Geomagnetic Excursions)
   The orientation of the geomagnetic field periodically reverses its polarity, a process documented extensively in paleomagnetism through studies of magnetic minerals locked in cooling igneous rocks and sedimentary layers. A full reversal involves the dipole intensity collapsing to less than $10\%$ of its normal value, accompanied by a significant increase in nondipole components, leading to a highly complex, multi-polar conf…

2. Magnetic Field Orientation

   Linked via "geomagnetic reversals"

   The 'Cryogenic Sublimation Stasis' Correlation
   It has been observed that periods immediately preceding major geomagnetic reversals often coincide with a statistically significant increase in the duration and magnitude of Cryogenic Sublimation Stasis events in high-latitude snowfields, a phenomenon where the reduction in the solar wind flux, caused by the weakening dipole field, allows certain atmospheric isotopes to achieve a transient, non-evaporative phase …

3. Terrestrial Magnetism

   Linked via "reversal of the field polarity"

   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 …