Why the Northern Lights Can Make Sounds (Yes, Really)

Why Auroral Sound Is Such a Difficult Scientific Question

Auroras are light emissions produced when energetic particles guided by Earth’s magnetic environment collide with oxygen and nitrogen in the upper atmosphere. NASA places much of the familiar green auroral glow roughly 100 to 200 kilometres above the surface, while red emissions commonly occur at still greater heights.

That altitude creates an immediate problem for the idea of direct sound. Light reaches an observer almost instantly, but ordinary sound must travel through matter and moves through air at only a few hundred metres per second. A noise produced 100 kilometres overhead would take roughly five minutes to arrive under idealized conditions—not appear to match a flash in real time. The upper atmosphere is also extremely thin, making efficient transmission of ordinary audible sound toward the ground difficult.

Centuries of Reports: More Than One Kind of “Auroral Sound”

Historical accounts from northern regions describe a surprisingly varied soundscape: whispering, swishing, crackling, snapping, clapping, or a noise resembling static. These testimonies matter because they show that the idea did not begin with modern tourism or viral videos. At the same time, testimony alone cannot establish a physical cause.

A quiet winter landscape contains many possible impostors. Frost can fracture wood or ice, wind can move snow and vegetation, clothing can rustle, distant human activity can carry through a temperature inversion, and expectation can influence what a listener notices. A convincing investigation therefore needs synchronized microphones, magnetic measurements, weather data, and controls that help distinguish a candidate event from ordinary background noise.

What Finnish Researchers Recorded

The best-known modern work comes from acoustics researcher Unto K. Laine and the Auroral Acoustics project associated with Aalto University in Finland. During geomagnetically active periods, the project recorded short acoustic events described as claps, reports, and crackles. In one 2012 observing campaign near Karkkila, Finland, the project reported almost 90 distinct sound events while simultaneously measuring audio and very-low-frequency electromagnetic signals.

Later analyses compared the timing and characteristics of recorded sounds with magnetic disturbances. The research has appeared in peer-reviewed conference proceedings, including work presented through the Audio Engineering Society, the International Congress on Sound and Vibration, and the 2022 Baltic-Nordic Acoustics Meeting.

This is meaningful evidence that unusual, locally audible events can coincide with geomagnetic activity under certain conditions. It is not the same as proving that every historical report was caused by the same mechanism, nor does it establish a universally accepted explanation.

The Near-Ground Electrical-Discharge Hypothesis

Laine’s proposed explanation moves the sound source away from the glowing aurora and much closer to the listener. On calm, cold nights, a temperature inversion can form when colder air remains near the ground beneath a warmer layer. The hypothesis suggests that opposite electrical charges may accumulate in separated parts of this lower-atmospheric layer.

A geomagnetic disturbance could then help trigger small electrical discharges within the inversion layer, producing brief crackles or pops at an estimated altitude of roughly 70 to 80 metres. A nearby source would solve the timing problem: the light and the geomagnetic disturbance are linked through space weather, while the audible sound is generated locally rather than travelling down from 100 kilometres or more.

Research published in 2019 further explored a possible relationship between the recorded crackling events and Schumann resonances—extremely low-frequency electromagnetic resonances in the space between Earth’s surface and the ionosphere. The proposed chain of events is intriguing, but it should still be described as a hypothesis supported by a limited body of research, not as settled atmospheric physics.

Radio “Sounds” Are Not the Same as Sound in the Air

Auroral activity is associated with plasma waves and radio emissions in near-Earth space. Scientists can detect these electromagnetic signals and convert their changing frequencies into audio that humans can hear. NASA recordings of whistler-mode chorus, for example, can resemble chirps or birdsong.

Those recordings are valuable scientific data, but they should not be confused with an observer hearing a crackle through the air. Radio and plasma waves are electromagnetic phenomena; audible sound is a mechanical pressure wave moving through a material medium. Turning a space signal into an audio file is a form of data translation, not evidence that the same noise naturally reached someone standing beneath the aurora.

Could Perception Still Play a Role?

Yes. Human perception is not a passive recorder. In a dark, emotionally charged setting, the brain combines sight, expectation, memory, and faint sensory cues. A sudden movement in an auroral curtain may cause an observer to associate an unrelated nearby sound with the light. This does not make the experience dishonest or meaningless—it simply means that controlled measurements are needed.

Researchers studying the historical dispute have also noted that culture shapes how auroral experiences are described. Northern traditions contain stories that portray the lights as living, spiritual, dangerous, or communicative. Such traditions preserve valuable observations, but cultural meaning and physical explanation answer different questions and should not be treated as interchangeable.

How to Listen Without Fooling Yourself

No location or tour can guarantee audible auroral events. Still, a careful observer can improve the quality of an informal listening session and reduce obvious sources of error.

Where and When to Watch the Northern Lights

Auroras are most frequently seen beneath the auroral oval at high geomagnetic latitudes. Well-known viewing regions include northern Alaska, northern Canada, Greenland, Iceland, northern Norway, Sweden, Finland, and parts of northern Russia. During strong geomagnetic storms, the visible oval can expand toward lower latitudes.

Darkness, clear skies, and low light pollution are essential. NOAA notes that geomagnetic storms—and therefore strong auroral opportunities—show a statistical tendency to occur near the spring and autumn equinoxes. Yet local darkness still matters: a place can be geomagnetically active and remain unsuitable for viewing because of daylight, cloud, moonlight, or urban glow.

Common Questions About Auroral Sounds

A Mystery Worth Studying—Carefully

The most responsible conclusion sits between dismissal and certainty. Historical testimony is too persistent to ignore, and modern recordings show that unusual acoustic events can coincide with geomagnetic activity. Yet the mechanism, frequency, and geographic range of those events remain incompletely established.

The Northern Lights do not appear to “sing” in the ordinary sense, and the glowing upper atmosphere is unlikely to send synchronized crackles directly to the ground. A more plausible possibility is that space weather occasionally helps create a separate electrical effect in the lower atmosphere. That idea is scientifically testable—and that is what turns a beautiful piece of folklore into a genuinely interesting research question.