NASA launched two sounding rocket missions from Alaska to measure auroral electrical currents and study geomagnetic storm impacts on Earth’s upper atmosphere and space-based systems.

NASA is launching a rocket mission from Alaska as early as Saturday to study and help understand electrical circuitry underlying the aurora. The rocket mission will use a technique similar to how a CT scan works on humans, to reconstruct the electrical currents flowing from the northern lights, NASA said.

NASA has pulled off a high-flying aurora investigation, launching three rockets into the glowing northern lights over Alaska. One mission targeted mysterious dark patches called black auroras, while the twin GNEISS rockets created a 3D scan of the aurora’s electrical currents.