The Northern Lights — or Aurora Borealis — are one of the most breathtaking natural light shows on Earth . Shimmering curtains of green , pink , purple , and red ripple silently across the night sky near the Arctic Circle . The same phenomenon happens near the South Pole too, where it is called the Aurora Australis . Together , the two are known as the polar lights .
✨ Auroras have been seen and wondered at for thousands of years . Ancient peoples in different cultures thought they were gods , spirits , dancing ancestors , or omens — long before science explained them.
The real cause begins with the Sun. The Sun constantly blows a stream of charged particles — mostly electrons and protons — called the solar wind . When this stream reaches Earth , our planet's magnetic field deflects most of it. But near the magnetic poles some particles funnel down into the upper atmosphere , where they collide with gas molecules and cause them to glow — exactly like the gas inside a neon sign .
📷 NASA · Public domainEarth behaves like it has a giant bar magnet inside it, with magnetic poles near the North and South . This invisible magnetic field is actually a shield : it protects us from most of the Sun's harmful particles . The auroras are the beautiful , visible sign of that shield doing its job, channelling particles down towards the poles .
🧩 Put the steps that create an aurora in the right order.
Gas molecules glow, creating the aurora ? ⤒ ↑ ↓ ⤓
Particles collide with gas in the upper atmosphere ? ⤒ ↑ ↓ ⤓
Earth's magnetic field guides particles towards the poles ? ⤒ ↑ ↓ ⤓
The Sun releases a stream of charged particles ? ⤒ ↑ ↓ ⤓
✨ Different gases produce different colours . Oxygen at high altitude glows red; oxygen at lower altitude glows green (the most common colour ). Nitrogen produces blues and purples .
The colour of an aurora is a clue to what gas is glowing and how high up it is. Most auroras are green , which comes from oxygen about 100 kilometres above the ground . Rarer red auroras come from oxygen much higher up. Blue and purple edges come from nitrogen . So the dancing colours are really a map of the gases in our upper atmosphere .
🔗 Match each aurora colour to its cause.
The stream of particles from the Sun Nitrogen gas glowing Oxygen very high in the atmosphere Oxygen about 100 km up (most common)
The stream of particles from the Sun Nitrogen gas glowing Oxygen very high in the atmosphere Oxygen about 100 km up (most common)
The stream of particles from the Sun Nitrogen gas glowing Oxygen very high in the atmosphere Oxygen about 100 km up (most common)
The stream of particles from the Sun Nitrogen gas glowing Oxygen very high in the atmosphere Oxygen about 100 km up (most common)
Auroras are most spectacular around the 'auroral ovals' — ring-shaped zones centred on the magnetic poles . In the north this includes parts of Norway , Iceland , Alaska , Canada , and northern Scotland . During strong solar storms the oval expands and auroras can occasionally be seen from much further south than usual .
📷 Dre Erwin Photography · CC BY-SA 4.0💡 The best conditions for aurora-spotting are a clear , dark sky, away from city lights , on a night with high solar activity . Websites and apps track the 'Kp index' — a measure of geomagnetic activity — to help you know when auroras are likely .
🗂️ Sort each statement as true or false about auroras.
Auroras are caused by particles from the Sun
? True False
Green is the most common aurora colour
? True False
Auroras happen most often near the equator
? True False
The Moon's light causes auroras
? True False
✍️ Fill in the aurora facts.
Auroras near the North Pole are called the Aurora _____ , and near the South Pole they are called the Aurora _____ . The stream of particles from the Sun that causes them is the solar _____ .
Borealis Australis wind Solaris Polaris
