Auroras, known to many as the northern lights, are a beautiful and mysterious phenomenon. To the casual observer the streaks of colored light across the sky can seem miraculous and inexplicable.

And one kind in particular, called a pulsating aurora, has indeed been mysterious to scientists, who have never been able to directly prove their hypothesis about how it’s formed. Now, armed with better technology, researchers from Japan say they’ve finally caught the aurora in the act.
Sky Light