Why do auroras appear in polar regions?
Show answer & explanation
Answer: Magnetic field funnels particles
Cold temperatures enable light — Wrong. Temperature doesn't cause auroras. They form when solar particles collide with atmospheric gases, guided by Earth's magnetic field toward poles.
Magnetic field funnels particles ✓ — Correct! Auroras form when solar wind (charged particles) interacts with Earth's magnetosphere. The magnetic field funnels particles toward magnetic poles. At ~100-300km altitude, particles collide with oxygen/nitrogen, exciting atoms. When electrons de-excite, they emit light—green/red (oxygen), blue/purple (nitrogen). Stronger solar storms create more intense auroras!
Poles receive more solar wind — Wrong. Solar wind reaches Earth globally, but Earth's magnetic field channels particles toward polar regions where they enter the atmosphere.
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