Scientists reported new evidence of small electrical discharges on Mars after examining wind recordings from NASA’s Perseverance rover. The signals, described as “mini lightning,” were identified when the rover’s microphone captured crackling sounds during dust storms and dust devils. A French-led research team recorded 55 events over two Martian years and explained that most incidents occurred on the windiest days close to the rover’s mast. The findings indicated a pattern of electrical activity that had been suspected on Mars for many years. Experts stated that the discovery is important because the planet’s thin, carbon dioxide–rich atmosphere and constant dust movement create conditions that could support electrical buildup.

Further study showed how the discharges formed and why they were difficult to confirm. Acoustic and electric data revealed that dust devils produced short bursts lasting only a few seconds, while larger storms created discharges that continued for up to 30 minutes. Because Mars’ atmosphere absorbs sound, the signals were weak and required detailed analysis before being accepted. An independent researcher noted that the evidence was encouraging, although full confirmation still depended on future instruments designed to observe lightning directly. Scientists said the discovery may influence mission planning because frequent static-like discharges could interfere with sensitive equipment. Perseverance has also supplied other audio information that expands understanding of Martian surface conditions. NASA is continuing to examine safe and cost-efficient plans for returning the rover’s rock samples to Earth.