Space Weather Warnings: How Solar Flares Could Further Disrupt Global Supply Chains

Finding out that one of the biggest threats to international trade is not a pandemic, a port strike, or a tariff dispute causes a certain kind of unease. It’s the sun.

The same star that rises indifferently every morning, warming both shipping lanes and cargo yards, is also capable of unleashing something far less gentle: a coronal mass ejection traveling at speeds of up to 1,000 kilometers per second, carrying a magnetic fury that can destroy satellite systems, jumble GPS signals, and drive billion-dollar electrical grids to the verge of collapse.

Science fiction is not what this is. The entire Quebec power grid was shut down in about ninety seconds during a geomagnetic storm in March 1989. Not for ninety minutes. 90 seconds. Transformers in the US, the UK, and Canada suffered irreversible damage. Equipment for transmitting power from California to Sweden was taken offline.

Millions of people were left in the dark, and the world, which is still in the early stages of relying on networked digital infrastructure, hardly took notice of the wider alert.

The world has changed significantly since then. Compared to earlier periods in human history, supply chains are now longer, more delicate, and more reliant on precise timing. Solar activity can cause GPS systems on a container ship departing Shanghai for Rotterdam to become unstable. The refrigerated trucks waiting at the dock, the port cranes unloading it, and the logistics software coordinating its arrival all depend on electrical infrastructure that could be compromised by a strong enough geomagnetic storm.

Looking at that interconnected web, it’s difficult to ignore how many single points of failure there are and how few of them were created with space weather in mind.

The global damage from a 1989-style event occurring today is estimated by researchers to be between $2.4 and $3.4 trillion over the course of a single year, which is comparable to the economic devastation caused by major wars or financial crises. That figure is particularly concerning because about half of the damage occurs in their trading partners rather than in the nations directly affected by the storm.

Even if a country never loses a transformer, the economic shockwave would still be felt through broken supply agreements, disrupted imports, and cascading production delays. An estimated 3.9 to 5.6 percent of the world’s GDP has been lost. It’s not a rounding error. A generation’s worth of economic policy is rewritten and political careers are ended by such a contraction.

The eerie limit of what the sun is capable of is still the Carrington Event of 1859. Auroras blazed across skies as far south as Honolulu and Havana due to that storm. Telegraph operators in the US and Europe reported that their equipment sparked and caught fire, and some of them continued to send messages even after being cut off from power sources, relying solely on the storm-induced currents. According to the disturbance storm index, scientists estimate its strength to be between 850 and 1,760 nanoteslas.

These figures characterize a type of geomagnetic violence for which there is no real precedent in contemporary infrastructure. There is a 12 percent chance that another Carrington-scale event will happen in any given decade. That is not a remote possibility. That is about the same probability as receiving a full house in a particular hand of poker.

A Carrington-sized CME that erupted from the sun in August 2012 missed Earth by about a week, or 90 degrees of orbital separation. It would have come almost without warning if it had been Earth-directed. DSCOVR, NOAA’s Deep Space Climate Observatory, which presently offers real-time solar wind data from Lagrange Point 1, was not yet operational.

A fast-moving CME may only have a fifteen-hour window between detection and impact. That is a dangerously small margin for industries that require days to reconfigure operations, such as rerouting aircraft, stabilizing power grids, or reorienting satellite instruments.

For years, NOAA’s Space Weather Prediction Center has been working on this issue in a serious and unglamorous manner. According to studies commissioned by NOAA, accurate space weather forecasts help the electric power industry avoid losses ranging from $111 million for minor disturbances to as much as $27 billion for severe events. Their forecasts already assist electric utilities in reinforcing grid stability prior to major storms, and the economic value of those warnings is substantial.

When solar radiation increases, airlines use NOAA data to reroute polar flights. When a significant CME is approaching, satellite operators turn off sensitive instruments. The systems are in place. The question is whether the supply chain sector in particular has internalized the risk in any significant operational way, and whether they scale to the full extent of what a major event could require.

It’s still unclear if the majority of logistics and freight companies have actually put their operations through a multi-day GPS outage or a weeks-long regional power outage. One of the more striking pictures that surfaced during the May 2024 Gannon Storm showed agricultural tractors in Midwest fields deviating from their GPS-guided routes.

These weren’t state-of-the-art aircraft or military systems. These were farming machines using the same satellite navigation system that directs fleets of long-haul trucks and container ships. The machines were unable to perform their functions when those signals failed. All things considered, the disruption was minor, yet it still garnered media attention.

An event at the Carrington level wouldn’t be insignificant. For a day, it would not be in the news before fading. Whether governments, utilities, shipping companies, and logistics firms have truly built resilience into their systems or have just assumed that the sun will continue to behave itself, this kind of disruption would test not only infrastructure but also institutional memory and collective problem-solving capacity.

Seeing how slowly the discussion of space weather risk has permeated supply chain planning gives the impression that the majority of the industry is still operating under that presumption. Naturally, the sun hasn’t promised anything like that.