What Does Lightning Sound Like on Mars?

Perseverance rover recorded brief acoustic pops during dust activity on Mars that scientists now interpret as the first direct evidence of lightning in the planet's thin atmosphere. The signals were not the target of any instrument but emerged incidentally from the SuperCam microphone, which normally listens to laser impacts on rocks. Decades of prior searches with orbiters and dedicated lander instruments had found nothing, making the new data a modest but notable shift in understanding Martian weather and chemistry.

The Search for Electrical Activity Mars has long been known to host frequent dust devils and occasional planet-wide dust storms driven by seasonal heating. On Earth, colliding dust or ice particles readily build electric charge that discharges as lightning. Similar processes were expected on Mars, yet instruments on Mars Express and the Schiaparelli lander returned no detections. Mars lacks a global magnetic field and its atmosphere is over one hundred times thinner than Earth's, which limits the scale of any discharge. Researchers therefore treated lightning as theoretically possible but practically undetectable until the new acoustic records.