aurora | National Geographic Society - Deepstash
aurora | National Geographic Society

aurora | National Geographic Society

Curated from: education.nationalgeographic.org

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What Is Aurora (Northern Lighta)?

An aurora is a natural light display that shimmers in the sky,Colorful blue, red, yellow, green, and orange lights shift gently and change shape like softly blowing curtains. . Auroras are only visible at night, and usually only appear in lower polar regions.

Auroras are visible almost every night near the Arctic and Antarctic Circles, which are about 66.5 degrees north and south of the Equator. In the north, the display is called aurora borealis, or northern lights. In the south, it is called aurora australis.

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How Aurora Is Create?

How Aurora Is Create?

Solar storms on our star's surface give out huge clouds of electrically charged particles. These particles can travel millions of miles, and some may eventually collide with the Earth.

Most of these particles are deflected away, but some become captured in the Earth’s magnetic field, accelerating down towards the north and south poles into the atmosphere. This is why aurora activity is concentrated at the magnetic poles.

“These particles then slam into atoms and molecules in the Earth’s atmosphere and essentially heat them up.excitation’, but it’s very much like heating a gas and making it glow.

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What causes the different colours in the aurora?

What causes the different colours in the aurora?

Different gases give off different colours when they are heated. The same process is also taking place in the aurora.

The two primary gases in the Earth’s atmosphere are nitrogen and oxygen, and these elements give off different colours during an aurora display.

The green we see in the aurora is characteristic of oxygen, while hints of purple, blue or pink are caused by nitrogen

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