In May 2024, a significant solar storm, the most potent in over 20 years, unleashed its fury on both Earth and Mars. This event not only illuminated the skies with auroras visible as far south as Mexico but also provided a unique opportunity for scientific observation.
Solar Storm Observations
The solar storm was characterized by a class X2.9 flare and a large Coronal Mass Ejection (CME) originating from the sunspot region AR3664. While Earth experienced a spectacular display of auroras due to its magnetosphere deflecting much of the storm’s energy, Mars was directly impacted, allowing researchers to study the storm’s effects in detail.
Data Collection by ESA’s Orbiters
The European Space Agency’s (ESA) Mars Express and ExoMars Trace Gas Orbiter (TGO) worked in concert to gather data during this solar event. They employed a technique known as radio occultation, where the Mars Express transmitted a radio signal to the TGO as it passed behind Mars. This method, recently adapted for use between orbiters, allowed scientists to analyze the Martian atmosphere’s layers by observing how the radio signal was refracted.
The data revealed that the storm caused an unprecedented increase in electron densities in two atmospheric layers, specifically at altitudes of 110 km and 130 km (68 and 80 miles), with increases of 45% and 278%, respectively. This marked the highest electron counts ever recorded in these regions of Mars’s atmosphere.
Implications for Mars Research
Colin Wilson, an ESA project scientist, noted the significance of this technique, stating, “It’s great to see it in action.” The findings from this solar storm are crucial for understanding the interactions between solar activity and planetary atmospheres. ESA Research Fellow Jacob Parrott emphasized the storm’s impact, describing it as the largest response to a solar storm observed on Mars.
The storm also caused temporary computer errors in both orbiters, a common risk associated with space weather. Fortunately, the spacecraft were equipped with radiation-resistant components, allowing them to recover swiftly.
These observations underscore the importance of studying space weather, particularly as solar storms can pose risks to astronauts and disrupt satellite operations. The ability to forecast such events is essential, though challenging due to the unpredictable nature of solar emissions.
In total, the ESA team documented the aftermath of three distinct solar events associated with the storm, enhancing our understanding of how solar activity deposits energy into Mars’s atmosphere. This knowledge is vital, especially considering Mars’s history of atmospheric loss and water depletion, likely driven by solar particle winds.
This article was produced by NeonPulse.today using human and AI-assisted editorial processes, based on publicly available information. Content may be edited for clarity and style.
