Some time ago I came across a documentary which mentioned that there was a rift in the Earth's magnetosphere somewhere in the Atlantic in the year 2007, and that rift allowed a substantial amount of solar wind particles to penetrate the Earth's atmosphere. It was speculated that the Earth's magnetic core could have been affected, though the effects have yet to be fully understood.
It was also reported that such rifts have been occurring more often during the last few decades, thereby suggesting that climate change could have been one of the effects of solar wind on the Earth's magnetic core. Hey, what do I know...it's just an observation.