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[–] Thisismyvoatusername 1 points 3 points (+4|-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.

[–] TherealScrable 0 points 1 points (+1|-0) ago 

If you would look at a picture of the magnetosphere of the earth you would see how deformed it is by the solar winds.

It makes no sense for it to grow when there is pressure, rather it makes sense that it condenses and thus creates a stronger barrier against those winds, while with no winds it returns to its state of minimal energy, a magnetic field like that of a magnet.