v âruneš-e qotbigi, vâgardâni-ye ~
Fr.: inversion de polarité
1) A change in the → polarity of Earth's magnetic field
in which the north magnetic pole becomes the south magnetic pole and vice versa.
Also known as geomagnetic reversal or magnetic reversal. Earth's magnetic
field has reversed many times in the past and the time intervals
between these changes are known as → polarity epochs.