The Source of the Aurora Borealis: Electrons Surfing on Alfvén Waves

New experiments have shown the source of the aurora borealis. Researchers have demonstrated Alfvén waves accelerating electrons under conditions that correspond to Earth’s magnetosphere. The new experiments show that electrons “surf” on the electric field of the Alfvén wave in a plasma. These electrons are the ultimate source of the light we call the aurora borealis.