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[–] Thisismyvoatusername 1 points 1 points (+2|-1) ago 

The magnetosphere is a result of the Earth’s magnetic field interacting with solar activity. So it grows when there is more activity and shrinks when there is less. At least, I think that is how it works. How that then interacts with cosmic rays (in terms of being more or less protective), I don’t really know. Also, I’m pretty sure the solar activity is solar winds, so I’m not quite sure of the exact point he was making.