When was the last time the Earths magnetic field reversed itself?
To understand magnetic-field reversal, you first have to explore the nature of Earth’s magnetosphere. Theories as to its source range from the basic to the more complex. We’ll try to keep our explanation short and sweet. Currently, most scientists believe that the magnetosphere is predominately generated by electrical currents deep within Earth’s iron core. The heat generated there causes churning in the liquid outer core, which in turn produces a swirling whirlpool around the North and South Poles. This flowing current produces forces that extend beyond our planet and into outer space. Called Van Allen Radiation Belts, they run along the magnetic north and south poles, which are constantly in flux. These opposing tides of magne
