Understanding Solar Energetic Particles and Their Impact on Aviation and Space Missions

Solar energetic particles (SEPs) pose significant risks to modern technology, particularly in aviation and space exploration. Dr. Lulu Zhao, an assistant professor at the University of Michigan and the lead of NASA’s CLEAR Center, emphasizes the importance of understanding and predicting these particles, which can disrupt electronic systems in aircraft and spacecraft. SEPs, which include protons, electrons, and heavier elements, travel at high speeds and can cause single-event upsets (SEUs) in electronics, potentially leading to critical failures.

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Dr. Zhao explains that even a single high-energy particle can flip a bit in a microchip, affecting control systems. These particles are constantly present but their occurrences are unpredictable. They can reach Earth within approximately ten minutes after being emitted by the Sun, and their interaction with electronics can result in significant operational challenges. Aircraft flying at high altitudes are particularly vulnerable due to increased exposure to these particles, with polar routes facing even greater risks due to weaker magnetic shielding.

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The forecasting of SEPs remains a complex challenge. Dr. Zhao notes that while solar flares and coronal mass ejections are better understood, the relationship between these events and the production of SEPs is inconsistent. To address this, the CLEAR Center employs a combination of empirical models, physics models, and artificial intelligence (AI) to enhance forecasting capabilities. The goal is to extend warning times from minutes to a full day, allowing for better preparation and response.

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The implications of improved SEP forecasting extend beyond aviation safety. Dr. Zhao envisions a system similar to hurricane forecasting that could guide airlines in avoiding vulnerable routes and preparing for communication disruptions. In space missions, particularly those to the Moon and Mars, astronauts face heightened radiation risks without Earth’s protective magnetic shield. Mission planners must navigate the trade-offs between high cosmic ray exposure during solar minimum and increased SEP events during solar maximum.

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Despite advancements in forecasting, Dr. Zhao acknowledges the need for accuracy to avoid unnecessary disruptions in operations. False alarms could lead to significant operational challenges for airlines and space missions. The balance between timely warnings and operational integrity remains a critical concern.

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• “We are trying to build a space weather prediction framework for the solar energetic particles,” — Dr. Lulu Zhao, Assistant Professor, University of Michigan

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• “One bit flip is enough to cause trouble if you hit a very critical bit,” — Dr. Lulu Zhao

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• “Real-time monitoring of the Sun and the buildup of prediction models can guide industry,” — Dr. Lulu Zhao

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• “For the very high energy particles, shielding is almost impossible,” — Dr. Lulu Zhao

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In conclusion, as the CLEAR Center continues to develop its forecasting models, the hope is that these advancements will benefit not only aviation safety but also the broader community engaged in space exploration.

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