The allure of the northern lights has shaped human imagination for as long as people have looked up at a winter sky and tried to make sense of what they saw. Known scientifically as the aurora borealis, this atmospheric light display has been interpreted as the spirits of the dead, the armour of warrior women, a fox running across the snow, and a bridge to the gods long before any understanding of solar physics existed. At ConnollyCove, exploring these intersections of landscape, culture, and natural wonder is at the heart of what we do. Ireland’s own Gaelic traditions give the aurora a name and a story that most visitors to the country have never heard.
What makes the northern lights so compelling is not simply their visual drama but the way they sit at the crossing point of hard science and deep mythology. The two are not in conflict; they are different languages for the same awe. This guide explores both, with a particular focus on the Celtic and Gaelic traditions of the North Atlantic that are almost entirely absent from mainstream aurora coverage.
Table of Contents
The Science of the Aurora Borealis
The aurora borealis forms when charged particles released by the Sun, primarily electrons and protons expelled during solar flares and coronal mass ejections, are drawn towards Earth’s magnetic poles by the planet’s magnetic field. As these particles collide with oxygen and nitrogen molecules in the upper atmosphere, those molecules release energy as light. The colour of that light depends on which gas is involved and at what altitude the collision occurs.
Oxygen at around 100 km produces the most common colour: vivid green. At higher altitudes, oxygen reactions generate rare red hues. Nitrogen collisions produce blues and purples, typically visible at the outer edges of an active display. This is why a particularly strong aurora will show multiple colours simultaneously, a natural spectrum produced by the varying density of gases at different heights. The lights typically form between 80 km and 640 km above the Earth’s surface.
Why are the Lights Particularly Active Right Now
The sun operates on an 11-year cycle of activity. Solar Cycle 25, which began in late 2019, reached its peak between 2024 and 2026, making this one of the most active aurora periods in approximately two decades. During solar maximum, increased sunspot activity means more frequent and intense coronal mass ejections, which in turn push the aurora’s visibility zone significantly further south. Sightings have been confirmed in Ireland, northern England, and Wales during recent storms, where the lights had not been clearly visible for years.
Whispers from the Ancestors: Global Aurora Mythology
Before solar physics existed, every culture that could see the lights developed its own interpretation. These were not idle fantasies; they were serious attempts to understand a real phenomenon using the tools available: observation, pattern recognition, and storytelling.
Myth vs reality
| The Myth | Culture of Origin | What Science Explains |
|---|---|---|
| Valkyries riding across the sky, their armour reflecting light | Norse / Viking | Bright, fast-moving white-green aurora during geomagnetic storms |
| Revontulet — a cosmic fox sweeping its tail across the snow, sending sparks skyward | Finnish | Diffuse, fast-moving aurora with trailing streaks; “fox fires” in Finnish |
| Ancestral souls — the energies of the dead projecting their presence across the night sky | Sámi (northern Scandinavia) | Pulsing, rhythmic aurora activity during sustained geomagnetic events |
| Animal spirits — seals, whales, caribou — playing ball with a walrus skull | Inuit (Canada, Greenland, Alaska) | Multi-coloured, undulating aurora columns common in the high Arctic |
| Blood on the horizon — an omen of war or disaster | Medieval Europe (including Ireland) | Rare deep-red aurora caused by high-altitude oxygen at 300+ km during extreme solar events |
The Sámi people, indigenous to northern Norway, Sweden, Finland, and the Kola Peninsula, held the lights in both reverence and caution. Some communities avoided travelling during an active aurora, believing the spirits were too powerful to ignore. The Inuit traditions, stretching across Greenland, Canada, and Alaska, embedded the lights into their understanding of the afterlife and the relationship between humans and the animals they hunted. These are not primitive superstitions. They are sophisticated cultural systems for interpreting a phenomenon that is, even now, genuinely awe-inspiring.
The Celtic Connection: Na Fir Chlis and the Lights of the North Atlantic
Almost every piece of mainstream northern lights content focuses on Scandinavia, Iceland, or Finland. A significant cultural gap exists in the coverage: the aurora has deep roots in Irish and Scottish Gaelic tradition, and the North Atlantic coast of Ireland and Scotland offers both the cultural context and, increasingly, the sightings to make this a genuinely compelling travel destination.
In Scottish and Irish Gaelic, the northern lights are known as Na Fir Chlis — literally, the “Nimble Men.” Depending on the regional tradition, they are described as fallen spirits, warriors wrestling in the sky, or supernatural beings engaged in celestial combat. The blood shed in these sky-battles was believed to fall to earth, and spots of red-tinted quartz found on beaches in the Western Isles of Scotland were historically called “blood of the nimble men.” This detail-specific, material, grounded in landscape is the hallmark of living folklore rather than tourist myth. ConnollyCove’s coverage of Celtic mythology creatures explores similar traditions that blur the line between the natural world and the supernatural.
The Mirrie Dancers of the Northern Isles
In Shetland and Orkney, the islands at Scotland’s northern tip, historically caught between Norse and Gaelic cultural influence, the aurora is known as the “Mirrie Dancers.” The word “mirrie” derives from an Old Norse root meaning shimmering or glittering. Local tradition was ambivalent about the lights: watching them was acceptable, but whistling or waving at them was considered dangerous, as it could draw the dancers down and cause harm. This belief is documented across multiple northern cultures independently, suggesting a shared intuition about the aurora’s power that has nothing to do with cultural contact.
The Aurora in Irish Historical Records
The aurora appears in Irish medieval records, including the Annals of Ulster, which record unusual atmospheric events. An entry from 773 AD describes “fiery and red” skies over Ireland, almost certainly a particularly intense aurora during a period of high solar activity. For Irish monks writing in the margins of manuscripts, these events were not tourist attractions. They were divine signals, worth recording precisely because they were rare and significant. That same sense of significance is what the Tuatha Dé Danann mythology carries, a world where the boundary between the earthly and the otherworldly was genuinely porous.
The concept of the Sídhe, the fairy realms in Irish mythology, placed supernatural beings in liminal spaces: inside hills, beneath loughs, and, in some traditions, in the sky itself. The northern lights, appearing suddenly in a clear sky and departing just as quickly, fitted naturally into this framework. They were not explained away. They were incorporated.
Can You Hear the Northern Lights?
One of the most persistent questions about the aurora and one almost entirely ignored by mainstream travel content is whether the lights make a sound. Folklore from Finland, Shetland, and indigenous North American communities consistently describes clicking, hissing, or clapping sounds accompanying a strong display.
Until recently, scientists were sceptical. Aurora occurs at altitudes between 80 and 640 km, far too high for sound waves to travel to the ground in any conventional way. Research published by the Finnish Meteorological Institute found that auroral sounds are real, but generated close to the ground at about 70 metres altitude rather than at aurora altitude.
The mechanism is electrophonic: geomagnetic disturbances during a strong aurora create electrical effects in the inversion layer of the atmosphere, producing faint clapping or crackling sounds. The conditions require a strong geomagnetic storm and a specific type of temperature inversion. They are genuinely rare. This bridges mythology and physics cleanly: the folk traditions were correct that something was happening; they were wrong only about the source.
Chasing the Aurora: From Donegal to the Arctic Circle
Most aurora travel content defaults to Iceland, Tromsø, or Finnish Lapland. These are excellent destinations, but they are not the only ones — and for travellers already in Ireland or the UK, there are compelling local alternatives worth knowing about.
Best Dark Sky Locations in Ireland and the UK
The Inishowen Peninsula in County Donegal sits at Ireland’s northernmost point and offers some of the darkest, clearest skies on the island. During a strong geomagnetic storm (KP index of 5 or higher), sightings from Donegal’s north coast are well-documented. Malin Head, Ireland’s most northerly point, is the most reliable viewing spot, with low light pollution and an unobstructed northern horizon. For those in Scotland, the north coast of Sutherland and the Orkney Islands both offer excellent conditions, with the added Mirrie Dancer cultural context. Galloway Forest Park in southern Scotland holds International Dark Sky Park status and is accessible from much of northern England.
For the Arctic classic experience, Norway’s Tromsø remains the benchmark, with Abisko National Park in northern Sweden close behind for consistently clear skies. Iceland’s Thingvellir National Park combines aurora watching with an extraordinary landscape — the rift valley between the North American and Eurasian tectonic plates. Travellers planning a trip to Ireland who want to combine cultural heritage with astronomy should look at ConnollyCove’s Irish blessing traditions alongside the Donegal dark sky guide — the connections between landscape, light, and language run deep in this part of the world.
Practical Tips for Aurora Hunting
Check the KP index (available via NOAA’s Space Weather Prediction Center) at least 24 hours in advance, and again 30 to 60 minutes before heading out. Real-time solar wind data from the L1 observation point gives short-range predictions. A KP of 3 is sufficient for viewing from northern Scotland. A KP of 5 or above brings reliable sightings from Donegal and northern England. Dress in full winter layers regardless of the season. A camera with manual mode, a tripod, and a 20-second exposure at ISO 1600 will capture far more than the naked eye sees. Allow 20 minutes for your eyes to adjust to the dark before making judgments about visibility.
Conclusion
The northern lights are neither purely a Scandinavian phenomenon nor simply a travel bucket list item. They belong to the entire North Atlantic cultural tradition, including the Gaelic-speaking world of Ireland and Scotland, where they carry names, stories, and significance that have existed for centuries. At ConnollyCove, we believe that understanding a landscape means understanding its folklore alongside its science. The aurora seen from a cliff edge in Donegal carries the same physics as the aurora above Tromsø, but it carries a different story. Both matter. Explore more of Ireland’s rich cultural traditions through ConnollyCove’s guides to Irish proverbs and their meanings and our coverage of Celtic mythology and folklore.
Frequently Asked Questions
Here are the questions visitors most commonly ask about the northern lights, their mythology, and how to experience them.
What is the legend of the Northern Lights?
Legends vary by culture. Norse traditions linked the aurora to Valkyries, while Finnish folklore described it as a cosmic fox sweeping sparks across the sky (Revontulet). In the Gaelic tradition of Ireland and Scotland, the lights are known as Na Fir Chlis, the Nimble Men, believed to be supernatural warriors or fallen spirits wrestling in the sky.
Can you see the northern lights in Ireland or the UK?
Yes. During strong geomagnetic storms (KP 5 or above), the aurora is visible from Donegal, northern Scotland, and parts of northern England. Malin Head in County Donegal is Ireland’s most reliable viewing location, with the KP index needing to reach at least 5 for a reliable display.
How do you pronounce Na Fir Chlis, and what does it mean?
Na Fir Chlis is pronounced roughly “nah fir hlish” in Scottish Gaelic. It translates as “the Nimble Men” — referring to supernatural figures believed to dance or fight in the sky during an aurora display.
Do the northern lights make a sound?
Yes, in rare conditions. Research published by the Finnish Meteorological Institute confirmed that faint clapping or hissing sounds during strong aurora events are real, generated by electrophonic effects in the atmospheric inversion layer at around 70 metres altitude, not at aurora height itself.
What is the best month to see the Northern Lights?
The aurora is most reliably visible between late September and late March, when nights are long and skies are dark. During Solar Cycle 25’s peak (2024–2026), unusual sightings outside this window have been recorded. Clear, dark skies and a KP index of 3 or above are the key conditions regardless of the month.
Why did the Vikings think the lights were Valkyries?
Fast-moving white-green aurora during strong geomagnetic storms resembles shimmering, reflective armour in motion. Viking cosmology already included the concept of Valkyries riding across the sky to collect fallen warriors, making the aurora a natural fit for an existing belief system.
