Earth’s magnetic field is unstable. Not only does it vary in intensity, but from time to time it flips, with the poles reversing sign. Much of this behaviour remains a mystery, but a combination of geomagnetic observations with theoretical studies has been providing enlightenment.
See also : Earth’s Magnetic Field May Be About To Reverse, devastating Humanity
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A Twenty-Six Decade Record of Atlantic Hurricanes
R. Garibaldi et al., 2016
Journal of Atmospheric and Solar-Terrestrial Physics, 148, 48-52
As for the potential cause behind the downward trend, Rojo-Garibaldi et al. examined the possibility of a solar influence, performing a series of additional statistical analyses (spectral, wavelet and coherence wavelet transform) on the hurricane database, as well as a sunspot database obtained from the Solar Influences Data Analysis Center of the Solar Physics Department of the Royal Observatory of Belgium. Therein, their exploratory analyses revealed that “this decline is related to an increase in sunspot activity.”