Aurora mysteries unlocked with NASA's THEMIS mission

A special type of aurora, draped east-west across the night sky like a glowing pearl necklace, is helping scientists better understand the science of auroras and their powerful drivers out in space. Known as auroral beads, these lights often show up just before large auroral displays, which are caused by electrical storms in space called substorms. Previously, scientists weren't sure if auroral beads are somehow connected to other auroral displays as a phenomenon in space that precedes substorms...