The Sky at Night – The Perfect Storm confronts a threat most of us never think about: the Sun, the very star that gives us light and warmth, is also capable of crippling the technology that runs modern life. Space weather is the danger at the heart of this episode, and it is not science fiction. Solar storms can fling billions of tons of supercharged plasma across the Solar System at millions of kilometres an hour, and when that material slams into Earth, it can damage power grids, scramble navigation, and silence communications. The Sky at Night – The Perfect Storm traces how scientists are racing to understand, forecast, and defend against this hazard before the next great storm arrives.
The story begins with a single observation made more than 160 years ago and stretches all the way to deep-space missions still being built. Along the way, presenters Chris Lintott and Maggie Aderin meet the researchers turning a poorly understood cosmic risk into something we can predict and prepare for. From the Royal Astronomical Society’s archives to a 24/7 forecasting centre in Exeter, the episode shows how seriously the threat is now taken.
What emerges is reassuring rather than terrifying. Space weather is real, and a worst-case event would be severe. But the UK is leading global efforts to build resilience, and the science is advancing fast.
The history of space weather as a measured phenomenon starts with Richard Carrington, born 200 years ago and obsessed with the Sun. On 1 September 1859, the talented astronomer was projecting an image of the Sun onto a screen, the only safe way to study it, when he watched a vast sunspot group suddenly brighten. He had just become the first person in recorded history to witness a white-light solar flare in real time.
Carrington could not have known what came next. The flare he saw accompanied a coronal mass ejection, a violent eruption that hurled an enormous cloud of plasma toward Earth. Roughly 17 hours later, a massive geomagnetic disturbance gripped the planet. The most visible effect was the aurora. Normally confined to the edge of the Arctic Circle, the Northern Lights were reported by ships’ captains as far south as the Caribbean.
The consequences went far beyond a light show. The telegraph network, the Victorian internet, was thrown into chaos as electrical currents surged through copper lines spanning continents. The particles triggered currents in the upper atmosphere, which were then induced in the wires. Some operators kept sending messages even after disconnecting their power supplies. Others were electrocuted, and telegraph stations caught fire. It was the first clear sign that activity on the Sun could reach down and disrupt human technology.
The Sky at Night – The Perfect Storm
Why a Carrington Event Today Would Be Far More Devastating
At the time, Carrington’s discovery was controversial. Nobody understood how something happening on the Sun could have such a dramatic impact on Earth. Only much later did the connection become clear, and the episode is now known as the Carrington Event, capitalised in a way that finally gives the astronomer his due.
The unsettling truth is that a repeat would hurt far more now than it did in 1859. Modern society depends on systems exquisitely sensitive to geomagnetic and radiation effects: radio communications, power distribution, and spacecraft operations. With satellite systems crippled and power grids pushed beyond their limits, the fallout would be immediate. GPS could fail, global communications could collapse, internet access could vanish, and vast regions could be plunged into darkness. One study estimated that a Carrington-class solar storm striking the United States would cause trillions of dollars in damage.
This is why extreme space weather now sits on the UK Government’s National Risk Register, alongside flooding, cold snaps, and heatwaves. Professor Jim Wild, president of the Royal Astronomical Society and a leading authority on the subject, frames it through the lesson of the Indian Ocean tsunami. Before that disaster, warning systems felt non-essential. Afterward, their absence seemed unforgivable. Responsible governments therefore plan for the reasonable worst-case scenario in advance, and the practical defence is surprisingly familiar: putting infrastructure on standby, much as a utility would before an Atlantic winter storm.
Miyake Events and the Terrifying Possibility of a Bigger Storm
A natural question follows. Is a Carrington-scale storm as bad as it gets, or could the Sun do worse? Statistically, an event on that scale occurs on average once every couple of hundred years. The last one was roughly two centuries ago, which might suggest we are due. However, statistics do not work so neatly, and the honest answer is that we simply have to wait and see.
More worrying is the growing evidence that Carrington sits near the tail of the distribution rather than at its extreme edge. Like floods, tidal waves, and volcanic eruptions, solar storms come in a range of sizes, and a larger one may be waiting on the horizon.
That suspicion is reinforced by an unusual archive: tree rings and ice cores. Isotopes locked inside them record sudden spikes of high-energy particles produced by the Sun, with nine such spikes in the last 15,000 years. Known as Miyake events, these were at least ten times more powerful than the storm Carrington witnessed. Their destructive potential is something scientists barely understand, and that uncertainty is precisely what drives the urgency behind modern space weather research.
How Earth’s Magnetosphere Shields Us and Quietly Endangers Us
To forecast solar storms, researchers first need to understand what happens when matter from the Sun reaches Earth. At the University of Warwick, Dr Ravi Desai studies that violent meeting. Charged particles and plasma stream off the Sun in every direction, and some of it travels across the Solar System to collide with our planet. What happens next is a fascinating interaction between that plasma and the magnetosphere.
Earth’s molten core generates a magnetic field that wraps the planet in a protective bubble. Incoming plasma cannot punch straight through it. Instead, the energy is diverted, channelled down toward the poles. On the side facing the Sun, the magnetosphere is relentlessly compressed by the solar wind. At the poles, it forms funnel-shaped openings where high-energy particles can slip into the atmosphere.
The magnetosphere is therefore not purely protective, and that ambiguity matters. Mars lost its atmosphere early in its history, around the time its planetary dynamo cooled and its global magnetic field disappeared. Earth’s field may well have shielded our planet and proved essential to sustaining life. Yet the same field also captures energy from the Sun, meaning it is not quite the impervious armour it first appears to be.
The Van Allen Belts and the Hidden War on Our Satellites
Some of that captured energy forms the Van Allen radiation belts, zones of high-energy particles trapped by Earth’s magnetic field. Fed by the solar wind and supercharged during solar storms, radiation levels inside these belts can swing wildly. They were discovered at the dawn of the Space Age, when newly launched satellites suddenly encountered swathes of energetic particles encircling the planet. Today those belts remain a primary hazard for satellites and astronauts alike.
The damage they inflict is insidious. Charged particles can flip a zero to a one inside a satellite’s memory, corrupting data so that the spacecraft behaves in ways its operators never intended. Charge can also build up until it arcs and breaks down, an event that can be catastrophic for the hardware.
The threat does not end with radiation. Solar storms pour energy into the upper atmosphere, heating it and making it expand. Dense air is pushed out toward the edge of space, and satellites suddenly meet drag they were never designed to handle. Orbits decay, the risk of collisions climbs, and some satellites fall back toward Earth. In 2022, a single event cost Starlink 38 satellites. The magnetosphere, for all its benefits, clearly creates serious challenges of its own.
Gorgon and the Race to Forecast Space Weather in Real Time
Understanding the magnetosphere’s behaviour over short timescales is the key to forecasting, and here the field faces a humbling reality. Space weather forecasting lags terrestrial weather forecasting by roughly 50 years. The problem is data. In space there are far fewer measurement points, and scientists are still working out the fundamental physics of how the Sun and Earth interact.
Work like Dr Desai’s aims to close that gap. One of his tools is a model called Gorgon, already applied in many contexts and now being transferred to the Met Office. On screen, it renders the magnetic field lines stretching out from Earth into space, then shows a solar storm striking and trapping particles along those lines. The colours shift to represent energy levels, and during a storm those energies spike dramatically, signalling significant danger.
Crucially, considerable effort has gone into making Gorgon run in real time. That capability allows it to provide nowcasts, telling satellite operators what is happening at this very moment. The ambition is to push further, forecasting events several days ahead, but that leap depends on observing the Sun far more effectively than we can today. The path forward is clear: more data, more missions, and more models. Tools like Gorgon could be the next great step in predicting space weather.
Inside the Met Office Space Weather Operations Centre in Exeter
Guest presenter Sophia Herod, usually delivering the daily forecast, travels to the Met Office in Exeter to explore a very different kind of weather. Space weather is among the highest priorities on the National Risk Register, and the Met Office sits at the centre of the UK’s response strategy. Its Space Weather Operations Centre is one of only a handful in the world staffed around the clock, constantly observing the Sun for activity that could reach Earth.
Manager Krista Hammond explains that, like ordinary weather, space weather is happening all the time with little consequence. The job is to catch the bigger event. When one arrives, the warning window is tight. The fastest coronal mass ejections, travelling at 600 to 700 kilometres per second, can reach us within about 15 or 16 hours. After analysis and computer modelling, that translates to at least 12 hours’ notice before a significant storm hits.
Those forecasts feed a wide network. The centre is a member of the National Space Operations Centre, a joint military and civil initiative, and it supplies warnings to government and to sectors such as aviation and energy. Even storms far smaller than the Carrington Event force every sector to scramble. Satellite operators shift spacecraft into safe modes or boost their orbits to fight drag. Airlines ground or divert flights to avoid radiation. Power grid operators make split-second decisions with backup generation on standby. Every one of those responses hinges on a single factor: early warning.
Coronagraphs, Sunspots, and the Limits of Predicting Solar Storms
The forecasters’ first clue usually comes from sunspots. On screen, Krista Hammond tracks a sunspot region through time, watching whether it grows or decays and examining its magnetic field. When opposing magnetic fields become tangled, enormous energy is stored, and that energy can be released as solar flares and coronal mass ejections. A significant flare, followed by a CME leaving the Sun on satellite imagery, is the signature of a major event in the making.
Much of the data comes from satellites, including coronagraph imagery from a spacecraft a million miles from Earth. A coronagraph uses a shield over the camera lens to block most of the Sun’s light, leaving only the corona visible, which is where these plasma bubbles can be seen erupting. Other instruments image the Sun in different wavelengths to pick out features invisible in ordinary light.
The hard limit is precision. Space weather is not a local phenomenon; a major storm can affect entire hemispheres. Yet where meteorologists draw on thousands of ground observations and abundant satellite imagery, space weather forecasters work with only a handful of satellites and sparse ground data. They can give a strong heads-up that something big is coming, but they are nowhere near the accuracy that terrestrial forecasting now achieves.
Vigil and the Deep-Space Mission Set to Transform Solar Storm Warnings
The most exciting fix on the horizon is a satellite programme called Vigil, to which the UK has been a key contributor. Its purpose is to give forecasters a brand-new side-on view of the Sun. When a coronal mass ejection erupts, that vantage point would reveal far more quickly whether it is heading for Earth, and offer a far better estimate of its arrival time.
At Imperial College London, Professor Jonathan Eastwood and his team are building instruments for this next generation of deep-space satellites. Vigil will travel to the L5 Lagrange point, one of the gravitational sweet spots where the pull of the Sun and Earth balance, allowing a spacecraft to hold position for years using almost no fuel. The James Webb Space Telescope occupies the L2 point; Vigil’s L5 station trails Earth by 60 degrees, 150 million kilometres away in deep space. Because the Sun rotates, an observer at L5 sees features on the solar surface days before they turn to face Earth.
Vigil carries three key capabilities. A magnetograph studies the surface and the development of sunspots from the side, raising the flag earlier when something is brewing. A second instrument images material travelling from the Sun toward Earth. A third measures the properties of the solar wind and its magnetic field, data as essential to a space weather forecast as wind and atmospheric conditions are to predicting rain. Together they promise forecasters a longer baseline, with a front view from Earth and a side view from Vigil sitting side by side.
Building for 2036: Why Space Weather Resilience Is a Race Against Time
Designing a magnetometer for Vigil demands a mindset unusual for a physicist. This is not a pure science mission. A measurement made on the spacecraft must reach a forecaster in a usable state less than an hour later, and the instrument has to keep working through the very space weather events it exists to monitor. Professor Eastwood describes himself as unusually customer-focused, because this is technology genuinely needed by the Met Office and industry, driven ultimately by socioeconomic impact.
That long horizon haunts the work. Vigil is being built in 2026 to operate in 2036, and nobody can be certain what daily life or our dependence on space technology will look like by then. The logic is unforgiving: the more we use space, the more exposed we become to space weather, and the greater the need to stay ahead of it.
The complexity is what makes the challenge so daunting. A severe storm is not a single impact. It can disrupt power grids through one physical interaction, degrade position, navigation, and timing through another, and damage satellite electronics through a third, all potentially at once, in different regions, in different ways. A power outage stacked on top of failed positioning and broken communications would be enormously difficult to manage. And while a truly severe event is described as a one-in-100-year occurrence, that return time means it is something we could realistically experience within the coming decades.
How to Safely Observe the Sun From Your Own Back Garden
For all the talk of deep-space missions, the Sun’s raw power can be admired from home, and early summer’s longer hours make it an ideal time to observe our nearest star. The first rule is non-negotiable: never look directly at the Sun without proper protection. Eclipse glasses carrying the ISO mark 12312-2 block 99.999% of visible light along with all ultraviolet and infrared, though even then you should not stare for long.
With safe equipment, real detail emerges. Sunspots are dark, cooler patches created by intense magnetic fields, lasting anywhere from a few days to several weeks, and large groups may be visible to sharp eyes without a telescope through a certified filter. Telescope users need more than eclipse glasses; a white light filter is essential to protect both eyesight and equipment. Such filters can be bought ready-made or built from certified solar film, cardboard, and tape, but must be checked carefully for tears or pinprick holes and discarded if any are found.
The rewards are striking. A white light filter reveals granulation across the photosphere, the textured surface caused by cells of hot plasma rising from the star’s interior. An H-alpha filter exposes the chromosphere, the Sun’s second atmospheric layer, where a lucky observer might catch a solar flare or, more commonly, a prominence. These eruptions are sometimes the precursors to coronal mass ejections, the same explosions of matter that paint the sky with the Northern Lights.
Space weather can sound like the plot of a disaster movie, yet The Sky at Night – The Perfect Storm makes a quietly hopeful case. Our understanding of solar storms is evolving rapidly, the UK is leading the way, and with experts across the world watching the skies for danger, the threat from the Sun is no longer one we face blind.
FAQ The Sky at Night – The Perfect Storm
Q: What is space weather and why is it dangerous?
A: Space weather refers to the conditions created when charged particles and plasma from the Sun collide with Earth. It only becomes weather we experience once solar storms strike our atmosphere. The most extreme events can damage power grids, disable navigation systems, disrupt communications, and harm satellites and astronauts.
Q: What was the Carrington Event of 1859?
A: The Carrington Event was the first scientifically recorded extreme solar storm. Astronomer Richard Carrington witnessed a white-light solar flare on 1 September 1859, accompanied by a coronal mass ejection. Around 17 hours later, a massive geomagnetic disturbance hit Earth, pushing the aurora as far south as the Caribbean and disrupting telegraph networks.
Q: How did the 1859 solar storm affect the telegraph system?
A: The storm triggered electrical currents in the upper atmosphere, which were then induced in the copper telegraph wires spanning continents. Operators could keep sending messages even after disconnecting their power supplies. More dangerously, some operators were electrocuted, and several telegraph stations caught fire, marking the first sign that solar activity could harm human technology.
Q: What would happen if a Carrington-class storm hit Earth today?
A: A modern Carrington-class storm could be far more damaging because society depends heavily on sensitive technology. GPS could fail, global communications could collapse, internet access could vanish, and entire regions could be plunged into darkness. One study estimated such a storm striking the United States would cause trillions of dollars in damage.
Q: How does Earth’s magnetosphere protect us from solar storms?
A: Earth’s molten core generates a magnetic field that forms a protective bubble around the planet. Plasma from the Sun cannot directly penetrate it, so the energy gets diverted toward the poles. However, the field also captures solar energy and forms funnel-shaped openings at the poles, so it is not fully protective.
Q: Why are the Van Allen belts hazardous to satellites?
A: The Van Allen belts are zones of high-energy particles trapped by Earth’s magnetic field and supercharged during solar storms. These particles can flip a zero to a one inside a satellite’s memory, corrupting data and causing unexpected behaviour. Charge can also build up until it arcs and breaks down, which can be catastrophic for hardware.
Q: How does the Met Office forecast solar storms?
A: The Met Office runs one of only a handful of space weather centres staffed around the clock. Forecasters watch sunspots for tangled magnetic fields that store energy, then use coronagraph imagery from a satellite a million miles away to spot coronal mass ejections leaving the Sun. They can give at least 12 hours’ notice.
Q: Why is space weather harder to predict than normal weather?
A: Space weather forecasting lags terrestrial forecasting by roughly 50 years, largely because of limited data. Meteorologists draw on thousands of ground observations and abundant satellite imagery, while space weather experts rely on only a handful of satellites and sparse ground data. Scientists are also still working out the fundamental Sun-Earth physics.
Q: What is the Vigil mission and how will it improve forecasting?
A: Vigil is a deep-space satellite mission, with key UK involvement, heading to the L5 Lagrange point 150 million kilometres from Earth. Because the Sun rotates, Vigil sees developing activity from the side days before it faces Earth. This side-on view gives forecasters extra warning and better arrival-time estimates for incoming storms.
Q: How can you safely observe the Sun at home?
A: Never look directly at the Sun without proper protection. Use eclipse glasses carrying the ISO 12312-2 mark, which block 99.999% of visible light plus all ultraviolet and infrared. Telescope users need a certified white light filter to see granulation, while an H-alpha filter reveals the chromosphere, solar flares, and prominences.
