Miniature lightning-like sparks created by whirling dust devils on Mars were discovered by chance in audio recorded by the Perseverance rover’s microphone. A team reports in Nature that the rover captured evidence of short electrical arcs only a few centimeters long, accompanied by audible shockwaves.
Researchers had long suspected that moving dust and sand on Mars could become electrically charged. Laboratory experiments in the 1970s showed that Martian-pressure air and agitated volcanic sand produce a visible glow from electrical charging, and larger charge buildups could lead to sudden discharges like spark plugs—or, on a larger scale, lightning. On Earth, lightning is known to occur in volcanic ash clouds, so similar processes on Mars are plausible.
Perseverance has been traversing Mars since 2021 and carries a microphone that previously recorded the sounds of a dust devil passing over the rover. In those recordings, scientists heard brief snaps amid the wind and dust noise. After attending a talk on atmospheric electricity, team members revisited the audio. They ran experiments on Earth using an electrostatic generator to see how electrical discharges would register on the microphone and found the same signature: a brief electromagnetic interference followed by the acoustic shockwave.
Over two Martian years, the team identified 55 such events, typically linked to dust devils and dust-storm fronts. The arcs felt and sounded like strong static-electricity sparks. Some events occurred in daylight, when small discharges would be hard to see in bright sunlight, but others happened at night.
Experts not on the team, like Daniel Mitchard, note this recording provides the kind of direct surface-based detection of Martian electrical activity scientists have sought for decades. Ralph Lorenz and colleagues point out that understanding this atmospheric electricity matters for future missions: electrical discharges could pose risks to electronics or operations. For instance, the Soviet Mars 3 lander ceased transmitting after about 20 seconds during a dust storm; an electrical event remains one possible explanation.
The discovery doesn’t imply Earth-style thunderbolts on Mars, but it does confirm that small-scale electrical discharges occur in dusty, turbulent Martian conditions. Studying these sparks will help assess hazards and deepen understanding of Martian atmospheric processes.
