Ever wanted to see how sunspots form and change as they grow? The folks working with NASA’s SDO satellite just released this amazing video of the adorable younglings.
Not much happens until about 18 seconds in, and then a lot happens.
That is so freaking cool. Taken over the course of two weeks (half a rotation of the Sun), you can see them pop up, darken, and grow, and even rotate a bit as the Sun’s complex magnetic fields change… and the neatest part to me is the foreshortening they undergo as they approach the east side of the Sun’s disk. Amazing!
Sunspots are actually regions of slightly cooler material at the Sun’s surface. Hot plasma (ionized gas, stripped of one electron or more) rises from the solar interior, reaches the surface, cools off, and sinks back down. This is called convection, and is the same process you see in a pot of boiling water. But at the surface, the tortured and twisted magnetic field of the Sun can suppress convection, preventing the cooler material from sinking. Since the brightness of the plasma depends on the temperature, this cooler stuff is darker. Boom! Sunspot.
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