>>520738181
the earth has a magnetic field, only because of this magnetic field any life can exist on earth.
this magnetic field is not a uniform thing and in some places its stronger and in some it is weaker, this magnetic field changes over time, currently its getting weaker and weaker so more of the suns emissions come through.
your brain, your heart and actually every cell in your body have their own magnetic field, changes in the earths magnetic field have an effect on your body.