The relationship between cosmic rays and Earth's magnetic field is well studied, and actively monitored: http://www.geomag.bgs.ac.uk/education/earthmag.html htt

The relationship between cosmic rays and Earth's magnetic field is well studied, and actively monitored: http://www.geomag.bgs.ac.uk/education/earthmag.html http://www.geomag.bgs.ac.uk/education/earthmag.html However, it's a more complex data set to work with, given the vast dimensional dynamics of the field itself vs measuring the flux of radiation.