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by defrost
1042 days ago
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> What other impacts do the magnetic poles have? Animal migration | navigation and sheilding from cosmic gamma rays and high energy solar flux. On that last point for humans an instantanous reversal is not the big issue, it would be the transition from one state to the next that could conceivably see long (ish) periods either unprotected from high energy cosmic rays and|or some areas enduring concentrated gamma rays focused in by changing magnetic field lines. > Seems like navigation equipment and anything else that relies on polar north should already be baking this in. Have been for a century at least (in a rough fashion), the World Magnetic Model (WMM) and the International Geomagnetic Reference Field (IGRF) date back to the 1960s or so and have their parameters updated on a five year epoch to provide a detailed fine resolution surface field model with local vecotors and rates of change. https://www.ncei.noaa.gov/products/world-magnetic-model https://www.ncei.noaa.gov/products/international-geomagnetic... |
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