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Old 12th Jan 2019, 19:42
  #26 (permalink)  
Join Date: Oct 2007
Location: Moray,Scotland,U.K.
Posts: 1,401
From Wikipedia:
"A brief complete reversal, known as the Laschamp event, occurred only 41,000 years ago during the last glacial period. That reversal lasted only about 440 years with the actual change of polarity lasting around 250 years. During this change the strength of the magnetic field weakened to 5% of its present strength."
Does any electrical equipment depend on the Earth's field at startup?
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