Perseverance’s microphone accidentally captured tiny lightning-like sparks produced by spinning dust devils on Mars, according to a team reporting in Nature. The recordings show short electrical arcs only a few centimeters long, each accompanied by an audible shockwave.
Scientists have long thought that moving dust and sand on Mars can become electrically charged. Experiments in the 1970s found that volcanic sand agitated in air at Martian pressure can glow from electrical charging, and larger charge buildups could discharge suddenly—analogous to spark plugs or, on a much larger scale, lightning. Because volcanic ash produces lightning on Earth, researchers considered similar processes plausible on Mars.
Perseverance, on the ground since 2021, previously used its microphone to record a dust devil passing the rover. In those files the team noticed brief snaps hidden in the wind and dust noise. After hearing a talk about atmospheric electricity, they reexamined the audio and tested the signature in the lab. Using an electrostatic generator on Earth, they reproduced the effect: a brief electromagnetic interference on the detector followed by an acoustic shockwave. The match strengthened the interpretation that the rover had recorded electrical discharges.
Over two Martian years the team identified 55 such events, usually associated with dust devils or advancing dust-storm fronts. The arcs resemble strong static-electricity sparks in both feel and sound. Some happened during daylight, when tiny discharges would be hard to see against bright sunlight; others occurred at night.
Researchers not on the team welcome the result. Daniel Mitchard called it the kind of direct surface-based detection of Martian electrical activity scientists have long sought. Ralph Lorenz and colleagues emphasize practical implications: atmospheric electricity could threaten electronics or operations on future missions. For example, the Soviet Mars 3 lander stopped transmitting about 20 seconds into its descent during a dust storm, and an electrical event is one possible explanation.
The finding does not mean Mars has thunderbolt-style lightning like Earth’s storms, but it confirms that small-scale electrical discharges occur in dusty, turbulent Martian conditions. Studying these sparks will help evaluate hazards and improve understanding of Mars’ atmospheric processes.