Tag
#magnetosphere
2 articles
Earth & Climate
Auroras: Why the Sky Glows at the Poles
How solar-wind particles funneled to the poles by Earth's magnetic field excite oxygen and nitrogen high in the atmosphere, making it emit the green, red, and purple light of the aurora.
10 minAug 22, 2026
Earth & Climate
Earth's Magnetic Field
Why the field is not a buried bar magnet but the churning output of a planet's molten iron heart — how the geodynamo generates it, why the magnetic poles wander and occasionally flip, and how the magnetosphere it throws up keeps the solar wind off the atmosphere.
10 minJul 5, 2026