🌌 Why the Aurora Is Green (and Sometimes Red, Blue or Pink)

Watch the auroral oval expand around Earth's magnetic pole as the Kp geomagnetic index rises. Oxygen glows green at 100-200km and red above it, nitrogen adds a blue/magenta fringe below 100km during strong storms, and a location marker shows whether the display would be visible from Tromso, Scotland, southern England or beyond.

3D · Three.js / WebGL renderer · 60 FPS target · runs fully client-side, no install