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A geomagnetic reversal is a change in a planet's dipole magnetic field such that the positions of magnetic north and magnetic south are interchanged (not to be confused with geographic north and geographic south).
What do we mean by a magnetic reversal or a magnetic 'flip' of the Earth? The Earth has a magnetic field, as can be seen by using a magnetic compass. It is mainly generated in the very hot molten core of the planet and has probably existed throughout most of the Earth's lifetime.
Magnetic reversal or magnetic excursion is a complex process related to the coupling between fluid convection in the outer core and dynamo action (Wicht and Tilgner, 2010). From: Extreme Space Weather, 2022
3 Απρ 2019 · Extensive analysis now shows that the earth's magnetic field has reversed about 170 times over the last 100 million years. Scientists continue to evaluate data, and there is much disagreement over how long these periods of magnetic polarity last and whether the reversals happen at predictable intervals or are irregular and unexpected.
31 Ιαν 2018 · A geomagnetic reversal is when the north and south poles switch places, a process that has happened many times in Earth's history. Learn how it affects life on Earth, why it's not imminent, and what to expect from a weaker magnetic field.
23 Φεβ 2008 · Magnetic Reversals. After molten lava emerges from a volcano, it solidifies to a rock. In most cases it is a black rock known as basalt, which is faintly magnetic, like iron emerging from a melt--for which Gilbert already noticed a similar process.
Geomagnetic reversal, an alternation of the Earth’s magnetic polarity in geologic time. See polar.
