G0CQK
23 August 2016 17:34
4
Keep a hold of that compass as it may be useful after the next geomagnetic reversal. It has been quite some time since the last one so maybe one is due soon.
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A geomagnetic reversal is a change in a planet's magnetic field such that the positions of magnetic north and magnetic south are interchanged (not to be confused with geographic north and geographic south). The Earth's field has alternated between periods of normal polarity, in which the predominant direction of the field was the same as the present direction, and reverse polarity, in which it was the opposite. These periods are called chrons.
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Jim
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