A NASA Solar Dynamics Observatory video of a mid-level solar flare. The flare caused some radio blackouts on Earth, but bigger space weather incidents can cause major disruptions, something a Boston University researcher has a plan to mitigate.
Video Credit: Courtesy NASA Media Library
Scientific Frontline: Extended "At a Glance" Summary: Space Weather Geoengineering (StormWall)
The Core Concept: StormWall is a proposed space-based defense system designed to temporarily fortify Earth's magnetosphere against damaging space weather, such as solar flares and geomagnetic storms. By releasing specific chemical elements at the edge of Earth's protective magnetic bubble, the system aims to deflect harmful solar energy safely past the planet.
Key Distinction/Mechanism: Unlike current defensive measures that passively shield satellites or temporarily adjust their orbits, StormWall actively geoengineers the space environment. It works by launching spacecraft into geosynchronous orbit to release mass-loading materials (like barium or lithium). These chemicals photoionize to create a plasma barrier that disrupts the flow of solar energy and bounces the impending storm past Earth.
Major Frameworks/Components:
- Geosynchronous Spacecraft: A theoretical fleet of six spacecraft orbiting in tandem with Earth's rotation to act as the deployment mechanism.
- Mass-Loading Materials: Alkaline chemical elements (e.g., barium, lithium) strategically released into the space environment.
- Photoionization: The physical process where the released chemicals become electrically charged by solar radiation, seeding the targeted area with plasma.
- Magnetosphere Fortification: The underlying physics principle of increasing the density of Earth's natural magnetic shield to reflect harmful solar wind.
Branch of Science: Heliophysics, Space Physics, Aerospace Engineering, and Geoengineering.
Future Application: The eventual deployment of a planetary defense network capable of mitigating severe geomagnetic storms, safeguarding next-generation orbital infrastructure (such as proposed space-based data centers), and protecting commercial and military satellite networks.
Why It Matters: Extreme space weather has the potential to cause catastrophic damage to modern infrastructure by disabling global GPS, disrupting satellite-reliant financial transactions, and overloading terrestrial power grids. Proactive mitigation could prevent an estimated $2.4 trillion in economic losses during a massive, once-in-a-century solar storm.
Solar flares and geomagnetic storms can disable satellites and disrupt GPS signals. A Boston University researcher has designed a space-based system to better protect us from rogue interplanetary weather.
The weather on Earth can become chaotic at times, but in space, it can be extreme, and the effects can be far-reaching. Solar flares, giant explosions on the Sun, can send out streams of energy that block radio communications and destroy satellite electronics. Geomagnetic storms, caused by variations in solar wind, can interfere with GPS signals and spark current surges on Earth that overload power grids.
The impact of space weather is not limited to temporarily losing electricity or digging out dusty paper maps for directions when satellite navigation systems fail. Every electronic financial transaction in the world, for instance, relies on timestamps sent by satellites. In May 2024, a solar storm disrupted GPS systems used to accurately guide tractors in planting and harvesting crops, hobbling food production for days and costing US farmers $500 million.
Although satellites can be built with tougher shields or have their orbits adjusted, those are merely stopgap measures; there is currently little we can do to protect ourselves from space storms. Boston University researcher Brian Walsh has an idea to change that. He has been testing the theoretical feasibility of a system of spacecraft that could fire chemical elements to the edge of Earth’s magnetic field, temporarily fortifying our defenses and deflecting potentially damaging space weather. In simulations, Walsh and researchers from the University of Michigan found the system could cut the intensity of a major geomagnetic storm in half. The findings were published in the journal Space Weather.
“Since humans have been in space, we’ve been trying to predict what’s going to happen in the space environment,” says Walsh, a Boston University College of Engineering associate professor of mechanical engineering. “But we came up with a model that could flip the paradigm. It’s like people in a village who see a river flooding—maybe they can predict when that will happen, but probably what’s even better is if they could build a storm wall. That’s what we’re proposing here.”
Bouncing Storms Past Earth
Walsh says his idea for a weather wall in space was inspired by a natural phenomenon: material peeling off Earth’s atmosphere and floating to the edge of our planet’s protective bubble, the magnetosphere, to bolster it. “I thought, maybe you could turn [that process] up, increase the intensity of it,” he says.
His proposed system, named StormWall, would start with the launch of six spacecraft into a geosynchronous orbit matching Earth’s own rotation. Each craft would be fitted with a canister loaded with what the researchers call a mass-loading material. When released, the material—an alkaline chemical element like barium or lithium—would photoionize, a process that induces an electrical charge, seeding the atmosphere with plasma.
In their simulations, Walsh and his colleagues found that this plasma would disrupt the flow of energy between any solar storm and the magnetosphere, and that would be enough to bounce the space weather around and past our planet.
Not Science Fiction
Walsh admits a weather wall in space sounds a little like science fiction, but he says it is within our reach.
“When you apply some really serious physics to it, it does work. And the amount of mass we need, the launch capacities—it’s all within our capabilities,” he says. “People have always thought, ‘Space is huge, the Sun is massive, we just have to sit here and take whatever it gives us.’ But what we found is that we can impact it.”
People have always thought, ‘Space is huge, the Sun is massive, we just have to sit here and take whatever it gives us.’ But what we found is that we can impact it.
One of the biggest barriers to implementation is cost. Launching six spacecraft, together carrying the equivalent of about a dozen oil trucks’ worth of material, would not be cheap. Once the payload is fired out and photoionizes, the system would be dead and could not be replenished; it is one and done. But with private companies investing billions in space infrastructure, and even contemplating data centers in orbit, Walsh says the math on cost-benefit ratios could soon favor his proposed approach. In their paper, Walsh and his colleagues point out that a massive, once-in-a-century geomagnetic storm—the last one was in 1859—would cause devastating damage in space and on Earth, with power grid costs alone topping $2.4 trillion.
He is confident the team can bring down the StormWall costs, too. Next on their agenda is studying ways to halve the material used, simulating a pulsed release of materials to extend the system’s lifespan, and examining potentially more efficient orbits. They also want to dig deeper into the chemistry involved to nail down the best elements to use.
Although space junk is a major issue in Earth’s lower atmosphere, Walsh says any materials they pump into its higher reaches would quickly be carried out of the system after they have done their job. “The material drifts out on these natural highways, it leaves the system—the magnetosphere flushes the material out within six or so hours.”
Geoengineering Space
As the head of Boston University’s Space Physics and Technology Lab, much of Walsh’s broader research is focused on observing and better understanding the space environment around Earth; he and his team were recently part of a mission that sent a telescope to the Moon to image our magnetic shield. Although the StormWall project is loosely connected to that wider work, Walsh says it is a bit of an outlier. “This is quite different from what anyone is doing right now—I don’t know of anyone proposing to geoengineer space.”
Should the idea literally take off, he says that, unlike some space missions that might reap rewards for the few, this one would benefit us all.
“If you built it, if it were deployed, it would help all people on the planet,” says Walsh. “You couldn’t make it in a way that helped only one country, one group of satellites.”
Reference material: Demystifying Space Weather
Published in journal: Space Weather
Title: Terrestrial Space Weather Protection Through Human-Produced Mass-Loading
Authors: B. M. Walsh, D. T. Welling, and Z. Huang
Source/Credit: Boston University | Andrew Thurston
Edited by: Scientific Frontline
Reference Number: heli060326_01