Researchers Brian Walsh, Dan Welling, and Zhenguang Huang have proposed a system called "StormWall" to protect Earth from devastating solar storms. This system involves launching six spacecraft into geosynchronous orbit, each carrying substantial amounts of photoionizing material, such as alkaline elements like lithium or sodium. When released, this material would become plasma, creating an artificial buffer at the edge of Earth’s magnetic field to divert the charged particles from coronal mass ejections (CMEs).
Simulations suggest that StormWall could reduce the intensity of a major solar storm by half, acting like a stone in a stream to redirect solar plasma. This defense is crucial, as a repeat of the 1859 Carrington Event, a solar storm that caused telegraph wires to ignite, could lead to over $2.4 trillion in damage today, crippling electrical grids, data centers, banking systems, and GPS. Recent powerful solar storms in May 2024, for instance, caused at least $500 million in losses for US farmers due to GPS signal disruptions.
The cost of implementing StormWall is estimated to be around $4 billion, comparable to the Artemis II mission. While expensive and a "one-shot deal" that requires resupply, the economic impact of a major solar storm far outweighs this investment. The system would also require precise timing, necessitating improved space weather prediction models and more comprehensive solar observation to release the material within a critical six-hour window before it dissipates. Despite the clear threat, researchers note a lack of proactive government and private sector action, with Walsh highlighting that, in 2018, the US Department of Homeland Security ranked solar storms as the second most likely, yet overlooked, threat after pandemics.
