wunder beta

🌌 How do auroras form?

Solar wind energy rides field lines into polar air; oxygen and nitrogen glow as they relax.

lessons

~10 min

to learn

🔬 Science

subject

Adults

level

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What you’ll learn

Solar wind meets a magnetic planetTrace auroras from solar wind and magnetospheric reconnection to polar particle entry.Solar plasma energy couples into Earth’s magnetic bubble; particles follow field lines into polar ovals.
Air that lights when struckExplain excitation of oxygen and nitrogen and how altitude shapes colors.Electron impacts excite air; photons of green, red, and blue-purple map gas and height, not ice reflections.
Ovals, storms, and mythsContrast borealis/australis symmetry, storm expansion, and pre-scientific myths.Both poles host ovals. Storms push lights equatorward. Spectroscopy replaced folklore with particle physics.

Questions this course answers

Order the chain that produces an aurora

Solar plasma energy enters the magnetosphere, particles hit the upper atmosphere, and atmospheric gases glow as they relax.

What directly produces the visible colors of an aurora?

Particle collisions excite oxygen and nitrogen; characteristic photon wavelengths appear as colors when those states relax.

Why do strong geomagnetic storms let people farther from the poles sometimes see auroras?

Enhanced coupling and energy input widen the ovals; mid-latitude observers sit under the expanded edge.

Grounded in trusted sources

NASA Aurora and Magnetosphere education resources
NOAA Space Weather Prediction Center — aurora and geomagnetic storm explainers
University of Alaska Fairbanks Geophysical Institute aurora FAQ
ESA and NASA IMAGE/Polar mission public science on auroral ovals

Every Wunder lesson is built from real, reputable sources — never invented.

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