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A geomagnetic anomaly led to meticulous documentation of the night sky and aurora occurrences in the Joseon dynasty. These records have now provided a base for revelations about the Sun's behavior.An image of active regions on the Sun from NASA’s Solar Dynamics Observatory. The glowing hot gas traces out the twists and loops of the Sun’s magnetic field lines.
Maunder Minimum, the most famous of these, was a period from 1645 to 1715 when sunspots practically vanished, and the Earth was cooler. This period is often referred to as the “mini ice age.” This unexpected finding challenges our understanding of the Sun’s behavior. It suggests that the solar dynamo— responsible for generating the Sun's magnetic fields— operates differently during periods of grand minima, causing the cycle to shorten.
France Dernières Nouvelles, France Actualités
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