At it's worst the southern ozone hole actually exposed part of Ausie land to unfiltered UV. Ozone is electrically charged so it likely is affected by the magnetosphere. Exactly how and how much I'm not sure. But the magnetic field reverses itself cyclicly in gelogic time. And as it switches direction there iss a brief period where it is nuetralized by equal alignments of forward and reversed magnetic domains in the geological strata. The variance over time results in grid north and magnetic north not agreeing to greater or lesser degrees. At the bottom of all military maps is a declination diagram which is a conversion factor to add or subtract in order to realine compass readings with grid north. But because that alignment changes overtimes older maps declination diagrams will not be correct for the present conversion factor. This is becaise as the plastic mantle lays down new layers under the old the domain alignment changes with currents in the molten material.
Topic: Earth losing it's magnetism (Read 8022 times)