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[Phys-L] solar cycle



Sunspots follow a 22-year cycle (return to same polarity), and this cycle
matches droughts on Earth. As the sunspot numbers increase, oceans become
warmer. But isn't the Sun's surface cooler during these times? How can a
cooler solar surface cause the Earth to warm up? I've never understood
this. Does it have to do with the increased solar magnetic activity that
heats the corona?