1) Physics: The condition, in a system, of having opposite characteristics at
different points, especially positive or negative with respect to electric charge or
Fr.: époque de polarité
The time during which the Earth's magnetic field was of a single polarity; an interval of time between reversals of Earth's magnetic field.
Fr.: événement de polarité
A specific event in the history of Earth's magnetic field. Usually used in reference to a specific → polarity reversal.
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.