Recordings made by NASA's Perseverance rover contain what researchers believe are the first detected electrical discharges in the Martian atmosphere. The brief events, described as mini-lightning, appeared in audio and electromagnetic data captured by the rover's SuperCam instrument near Jezero Crater.
A French-led team analysed 28 hours of microphone recordings collected across two Martian years, equal to 1,374 Earth days. The signals were usually associated with dust devils or the fronts of dust storms. Those moving columns and clouds can cause particles to rub and separate electrical charge, creating conditions in which small discharges may occur.
Lead researcher Baptiste Chide of France's Institute for Research in Astrophysics and Planetology said the finding could affect understanding of Martian atmospheric chemistry, climate and habitability, as well as planning for future robotic and human missions. If confirmed, the result would place Mars alongside Earth, Jupiter and Saturn among planets known to have electrical activity in their atmospheres.
The interpretation remains provisional. Particle physicist Daniel Mitchard wrote in Nature that the data provided persuasive evidence for discharges generated by dust, but noted that no flash had been seen. Because the phenomenon was recorded acoustically rather than visually, doubt remains over whether it should be classed as Martian lightning. The history of competing claims in this field makes further debate likely.
Researchers want future Mars missions to carry instruments specifically designed to measure atmospheric electricity, along with more sensitive cameras capable of looking for accompanying light. Such observations could test whether the crackles and electromagnetic signals arise from the same event and show how often discharges occur under different dust conditions.
Perseverance landed in 2021 and has spent four years exploring the Jezero region for evidence relevant to past biology. Mars today is cold and dry, but geological evidence indicates that billions of years ago it possessed a thicker atmosphere and liquid water. Jezero was selected partly because it bears signs of an ancient delta, making it a promising place to examine environments that may once have supported life.
The electrical result does not provide evidence of organisms. Its importance is environmental: discharges could alter atmospheric chemicals, interact with dust and affect equipment or future explorers. The published report supports a detection of signals consistent with electricity and a scientific interpretation linking them to dusty weather. It does not establish that visible lightning bolts occur on Mars. Confirmation will depend on observations designed to capture the electrical, acoustic and optical parts of the phenomenon together. Until then, the cautious description is dust-associated electrical discharge, not visually confirmed lightning.
