10/06/2021 09:09 PM | Click to read full article
For years, scientists hadn't been able to confirm how the northern lights cast their spectral glow across the sky.
But they'd long held a theory. First, eruptions on the sun release a stream of charged particles called the solar wind. Those particles interact with Earth's magnetosphere - the region around the planet controlled by its magnetic field. In the process, the field launches powerful electromagnetic waves in the direction of the Earth's surface.