In December 2023, a team of scientists studying data from Mars made an exciting discovery: a new atmospheric phenomenon that hasn’t been seen before on the planet. They were using instruments from NASA’s MAVEN (Mars Atmosphere and Volatile Evolution) mission when they observed something called the Zwan-Wolf effect. This effect has been known to occur on Earth, where charged particles move along magnetic structures, like toothpaste squeezed from a tube.
Christopher Fowler, a research assistant professor at West Virginia University and the lead author of the study, noted, “When I looked at the data, I noticed some unusual patterns.” He never expected to find this effect on Mars. The Zwan-Wolf effect was originally discovered in 1976, but this is the first time it has been observed in a planetary atmosphere, rather than just in magnetospheres.
Mars lacks a global magnetic field, so it interacts differently with solar winds compared to Earth. In this study, the Zwan-Wolf effect was spotted in the Martian ionosphere, where many charged particles exist. The MAVEN data showed these particles being pushed and organized in unique ways.
Mars does have an induced magnetosphere, which forms when solar wind hits its ionosphere. This magnetosphere can change shape depending on solar activity. Fowler’s team noticed that during a strong solar storm, they could clearly see the Zwan-Wolf effect in their data. This suggests that the effect might always be happening at low levels that MAVEN usually can’t detect, but the storm amplified it enough to be observed.
As they examined the weird fluctuations in magnetic field measurements, the team explored information from various MAVEN instruments. After considering other possible explanations, they confirmed that the Zwan-Wolf effect was responsible for the patterns they saw. Fowler remarked, “No one thought this effect could occur in an atmosphere, which adds a fascinating new layer to our understanding of space physics.”
This finding is crucial for grasping how space weather affects Mars. It also helps scientists understand how similar atmosphere-less bodies, like Venus and Titan, might behave. The implications of these observations extend beyond Mars, hinting at how powerful solar storms can impact environments around other planets and potentially affect missions sent there.
Shannon Curry, the principal investigator of MAVEN, emphasized, “Understanding space weather’s effects on Mars is key. We keep discovering connections between solar activity and the Martian environment.”
Launched in 2013, MAVEN’s mission is to study Mars’ upper atmosphere and its interactions with the Sun. This research sheds light on how the Martian atmosphere has changed over time. Unfortunately, the MAVEN spacecraft lost contact with Earth on December 6, 2025. An assessment team has since been formed to determine its current status and chances of recovery.
The discoveries made by MAVEN highlight the importance of continued exploration and understanding of planetary atmospheres and their interactions with space weather.
For further insights into Mars and its atmosphere, check out NASA’s official resources.
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Goddard Space Flight Center, Mars, MAVEN (Mars Atmosphere and Volatile EvolutioN), The Solar System
