The Earth's magnetic field also stretches several hundred miles into space and protects us from the sun's charged particles and cosmic rays by focusing them towards the poles. This is where they appear as the northern and southern lights as they excite gases in the atmosphere. As the magnetic poles migrate across the world, those night lights are going to light up some very strange places where they have never been seen before. During a field reversal, this protective magnetic shield is going to be weak and might even disappear for a century or more. That might drastically affect the weather