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📘 How polar stratospheric clouds glow

Explore high-altitude ice, twilight scattering, polar vortices, and the ozone chemistry on cloud particles.

lessons

~10 min

to learn

🔬 Science

subject

Adults

level

Start the course →

What you’ll learn

Stratosphere
Twilight
Ice surfaces
Polar vortex
Ozone chemistry
Ozone layer
Measurement
Types
Seasonal window
A visible clue

Questions this course answers

Where do polar stratospheric clouds form?

Extreme winter stratospheric cold allows their particles to form.

Why can PSCs look colorful?

Twilight geometry and ice or acid particles create nacreous colors.

How do PSCs support ozone loss?

Heterogeneous chemistry on particles activates chlorine before sunlight returns.

What does the polar vortex do?

Isolation favors very cold conditions and chemical accumulation.

What ends PSC chemistry?

The particle surfaces or isolated air must persist for the reactions to continue.

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