How a Solar Superstorm Nearly Sent Self-Driving Cars Off Course Last November

A Space Storm With Very Earthly Consequences

On November 11, 2025, the Sun unleashed a series of solar flares that struck Earth, triggering a severe geomagnetic storm that peaked for around six hours. While skywatchers marveled at the auroras it produced, engineers and scientists were watching something far more alarming unfold — GPS signals veering more than 33 feet off course, creating errors large enough to disrupt autonomous transportation and potentially put vehicles in danger.

As detailed in a new paper published in the journal Geophysical Research Letters, a team of scientists found that global navigation satellite systems experienced "significant positioning errors" of over 33 feet during the superstorm, "large enough to disrupt precision agriculture and autonomous transportation industries" across the continental United States. That's not a rounding error. For a self-driving car navigating a highway or an intersection, 33 feet is the difference between staying in a lane and veering into oncoming traffic.

What the Storm Actually Did to GPS

During a solar storm, the Sun blasts Earth with bursts of radiation and charged particles that overload and distort the planet's upper atmosphere, called the ionosphere. This slows and bends GPS radio signals passing through this layer. The effect is usually stronger near the equator and the polar regions, but it can extend into the mid-latitudes during intense geomagnetic storms.

Researchers combined aurora-camera observations with ground-based GPS receiver networks across the U.S. and Canada to measure the widespread technological fallout. During the peak of the six-hour geomagnetic disturbance, scientists observed high-energy electrons traveling down Earth's magnetic field lines and colliding with upper atmosphere gases across a wide range of latitudes. Strong signal fluctuations stretched almost entirely from the West Coast to the East Coast of the U.S. and reached as far south as Florida. The disruption wasn't a blip in one region — it was a coast-to-coast technology event.

Farming, Autonomous Vehicles, and a Lucky Break

Positioning errors of this magnitude pose direct operational risks to precision agriculture equipment and self-driving cars. The disruption threatens farming technology such as GPS-equipped tractors used during planting and harvesting seasons. The November storm, however, arrived after the main farming season had already wound down — a stroke of timing that may have spared the industry from massive losses. A previous severe geomagnetic storm in May 2024 struck during the U.S. farming season and generated more than $500 million in damages across the Midwest.

Beyond being ferocious enough to delay the launch of a Mars-bound NASA spacecraft, the storm wreaked absolute havoc with GPS systems back on the ground for hours at a time. The researchers were blunt about what a worse-timed version of this event could mean: "Had the November superstorm occurred during the farming season in the American sector, it could have caused significant economic losses for the American farming industry, in addition to affecting the autonomous transportation industry."

The Bigger Warning Hidden in the Data

Solar storms are hard to predict. Depending on where the Sun is during its 11-year cycle, our star experiences periods of high or low solar activity. While scientists can predict the possibility of an eruption during solar maximum, the exact moment of the event and its magnitude are difficult to forecast. That unpredictability is precisely what makes this research so urgent.

The autonomous vehicle industry has long marketed GPS-reliant navigation as a cornerstone of safety. This study forces a harder question: what happens when the infrastructure those systems depend on is knocked sideways by a force no software update can fix? Scientists are actively working on new tools to help them predict solar storms faster and more accurately. Until those tools mature, the November 2025 storm stands as a vivid reminder that some of the biggest threats to cutting-edge technology don't come from hackers or hardware failures — they come from 93 million miles away.