STEVE (Strong Thermal Emission Velocity Enhancement) is a thin ribbon of pinkish-red or mauve-colored light stretching from east to west, farther south than where aurorae usually appear. Even more strange, STEVE is sometimes joined by green vertical columns of light nicknamed the picket fence. According to a new study, published in the journal Geophysical Research Letters, STEVE’s picket fence is caused by a mechanism similar to typical aurora,...
