Green 557.7 nm dominates at 100–150 km where oxygen is dense. Red fringes appear above 200 km; violet nitrogen edges mark the curtain base.
Drag the Kp slider past 6 and the oval swells overhead — arcs break into rays, the horizon glows rose, and surge warnings trigger.
Click anywhere in the sky. The rocket climbs, samples field strength along its path, and reports peak nano-Tesla in the probe readout.
Sweep the cursor like a probe. Field deflection follows curtain distance — closest approach bends the needle readout live.