Aurora Borealis: Formation, Causes, and Northern Lights Explained

The Aurora Borealis, or Northern lights, is one of the most beautiful things nature shows us. Most of the time, we can’t see it, but when it appears, the sky lights up with amazing colours like green, red, pink, and purple, moving like waves or ribbons. 

For hundreds of years, people have observed this glow, always amazed at how the night sky comes to life.

The problem is that not everyone is able to view it. When tiny charged particles from the Sun collide with gases in the Earth's atmosphere, auroras are created. They typically show up close to the North and South Poles as a result.

This article is a simple guide to learn what is Aurora Borealis, how it forms, where you can see it, and even how similar lights happen on other planets.

Table of Contents

• What is Aurora Borealis
• How Do Auroras Form?
• Best Places to See the Aurora Borealis
• Why Do Auroras Sometimes Appear Far from the Poles?
• Auroras Across the Solar System

What is Aurora Borealis

Have you ever thought about what lights up the night sky with flowing colours near the poles? 

That’s the Aurora Borealis, one of the most breathtaking natural light shows on Earth. In the Northern Hemisphere, it’s called Aurora Borealis, while in the Southern Hemisphere, it’s known as Aurora Australis.

 

So, what causes these magical lights? Let’s find out.

Auroras, or northern lights, appear as ribbons, waves, or curtains of colour, often in green, red, pink, and purple. 

 

And where did the name come from? Let’s discuss the History of the Aurora Borealis 

“Aurora” is named after the Roman goddess of dawn, while “Borealis” comes from Boreas, the Greek god of the north wind. Even thousands of years ago, humans were surprised by this phenomenon. 

When did scientists start studying them? Ancient Chinese texts describe mysterious lights moving across the night sky, showing early curiosity about auroras. 

Then, in 1619, Galileo Galilei gave them the name “Aurora Borealis”, and in the 18th century, Henry Cavendish used triangulation to estimate that auroras occur around 100–130 km above Earth.

 

In 1902, physicist Kristian Birkeland proposed that auroras are created by electric currents in the upper atmosphere. Interestingly, this idea later inspired the invention of neon lights!

Did you know the earliest known record of an aurora is a cave painting in France, about 30,000 years old? People have been captivated by these lights for a very long time!

You might be wondering: how exactly do these beautiful lights appear in the sky? Let’s discuss.

How Do Auroras Form?

Auroras are created through the interaction of charged particles from the Sun with gases in Earth’s atmosphere.

To put it simply, here’s how it happens step by step:

The Sun is constantly sending out a stream of charged particles from its outer layer, called the corona. This stream is known as the solar wind.

Interestingly!! When these particles reach Earth, they don’t just fall straight down. Earth’s magnetic field guides them toward the North and South Poles, funnelling them into the upper atmosphere.

 

Once there, these particles collide with gases such as oxygen and nitrogen. These collisions release energy in the form of light, creating the glowing, colourful display.

Different gases produce different colours:

• Oxygen gives green or red light.
• Nitrogen produces pink, violet, or blue light.

But why only near the poles? 

Interestingly!! The answer lies in Earth’s magnetic field, which guides charged particles from the Sun into the atmosphere. When these particles collide with gases like oxygen and nitrogen, they release energy as glowing light, creating the spectacular display we see.

Auroras usually appear at altitudes between 80 and 250 km above Earth’s surface, forming ribbons, waves, and curtains of light that dance across the sky.

So, in short: solar wind → guided by magnetic field → collides with atmospheric gases → beautiful aurora lights fill the polar skies.

So, where can you actually see these magical lights? Let’s find out.

Best Places to See the Aurora Borealis

Aurora Borealis, or northern lights, is usually seen near the Arctic Circle, between 66°N and 69°N latitude, in what is often called the Aurora Zone. 

This is where Earth’s magnetic field directs solar particles most strongly, creating the most vibrant light shows.

 

So where is aurora borealis? 

The answer lies in some of these top destinations:

• Svalbard, Norway
• Kakslauttanen, Finland
• Jukkasjärvi, Sweden
• Reykjavik, Iceland
• St. Petersburg, Russia
• Northern Canada
• Scotland, United Kingdom

While these locations offer the most reliable sightings, there are times when auroras stretch far beyond the usual zones. 

During intense geomagnetic storms, the lights can even be seen at lower latitudes, reaching parts of Europe or the northern United States, giving more people the chance to experience this incredible phenomenon.

Interesting Fact: The Aurora Borealis in India has been spotted, but it is extremely rare, with sightings recorded in Ladakh during strong geomagnetic storms in April 2023 and October 2024.

Why Do Auroras Sometimes Appear Far from the Poles?

Interestingly!! Auroras are seen only in the Arctic and Antarctic regions. But sometimes, they surprise us by appearing much farther south, reaching mid-latitude areas. 

So what causes this unusual display? The answer lies in strong solar activity.

The Sun alternates between periods of low and high activity during its 11-year solar cycle. 

Sunspots and solar flares increase in frequency during the active phase. The typical aurora zones may be impacted by these occurrences, which can send a surge of energy towards Earth.

A Coronal Mass Ejection (CME) is one of the most potent triggers. This occurs when massive plasma and magnetic field explosions from the Sun are released into space. 

 

When a CME reaches Earth, it can create strong geomagnetic storms that push auroras closer to the equator. Recently, such events have made auroras visible as far south as England and other mid-latitude regions.

Another clue comes from sunspots, which are cooler regions on the Sun’s surface linked to solar flares. Sunspots often indicate that a CME or solar storm might be on its way, setting the stage for auroras to appear far from the poles.

Auroras Across the Solar System

Auroras are not exclusive to Earth, despite what you may believe. These beautiful light displays can be seen on any planet with a magnetic field. 

Indeed, a number of our solar system's planets exhibit auroral activity, occasionally to a greater degree than what is visible from Earth.

 

Let’s take a closer look at how auroras/northern lights appear on different planets:

Planet / Object	Aurora Characteristics	Observations
Jupiter	Extremely strong and bright auroras	Observed by Hubble and Galileo; connected with plasma from moon Io
Saturn	Massive auroras, more frequent than Earth’s	Observed by Cassini; caused by strong magnetic field and solar wind
Uranus	Visible auroral lights	Observed by Hubble Telescope and spacecraft missions
Neptune	Visible auroral lights	Observed by Hubble and spacecraft missions
Venus	Very weak auroras	Weak magnetic field limits auroral activity
Mars	Faint auroras	Discovered in 2014 by SPICAM instrument on Mars Express
LSR J1835 + 3259 (Brown Dwarf)	Extremely bright aurora	Detected in 2015; over a million times brighter than Earth’s auroras

In this article, we learned that even with all our technology, the northern and southern lights remain one of the most magical natural phenomena on the planet. 

So next time you see photos or videos of them, remember: these lights are not just beautiful; they’re a stunning reminder of the invisible forces shaping our world.