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The Day the Sun Hit Earth

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A True Story · Posted ·

The short answer

In 1859, 17.5 hours after an English astronomer saw a flash on the Sun, a magnetic storm as strong as any on record hit Earth. That night red auroras reached from Canada to Cuba. The next morning, operators in Boston and Portland, Maine, unhooked their batteries and sent messages on the storm's current.

The astronomer was Richard Carrington. What he saw at 11:18 that morning was the first solar flare anyone recorded. The storm now carries his name: the Carrington Event. In July 2012 a cloud like it left the Sun and missed Earth.

Sixty seconds at the telescope

Carrington was 33. His father owned a large brewery at Brentford and meant him for the church, but lectures on astronomy at Cambridge changed his plans. From November 1853 he drew the Sun's spots by hand. He threw its image onto a glass plate, as a picture about 28 cm (11 inches) across. Over seven and a half years his series came to 5,290 observations of 954 groups of spots.

On Thursday, September 1, 1859, at 11:18 Greenwich time, two patches of intensely bright white light broke out over a big group of spots. He says his time is good to within 15 seconds. His first thought was that light was getting in through a hole in his screen. He moved the telescope, saw that it wasn't a hole, and wrote down the time. Then he ran to call a witness. He was back within 60 seconds, and the light had already faded a lot. It was gone by 11:23.

He didn't need the witness. Richard Hodgson saw the same flash from Highgate, north of London. Carrington chose not to compare notes with him, so the two accounts would stay independent. Within minutes, a hanging magnet at Kew twitched. It recorded itself as a spot of light on photographic paper, so nobody saw the jump until the paper was developed.

That November, Carrington showed the Royal Astronomical Society his drawing and the Kew records. He still would not connect the flash to the storm. The Society's note on his talk ends with “One swallow does not make a summer.” Yet he had chosen the Sun as his subject years before, just after a link between the sunspot cycle and the magnetic cycle was announced. The flare was first tied directly to the storm by Bartels, in 1937.

Why the wires worked without batteries

A telegraph in 1859 was a battery, a wire and a magnet at the far end, with the ground as the return path. Michael Faraday had shown in 1831 that a magnetic field moving past a wire makes a current in it. A storm shakes Earth's magnetic field. By 1859 there were already about 160,000 to 200,000 km (100,000 to 125,000 miles) of telegraph line in the world.

A first storm hit on Sunday night, August 28. In New York an operator couldn't hold a steady current. Between Quebec and Father Point, men spent five hours trying to send 400 words, then closed the line. The big storm began about 17.5 hours after the flare, just before 5 in the morning in London. The field changed about twice as fast as on Sunday: around 500 nT per minute, against no more than 250. At Kew the trace ran off the paper both times. In Norway that week, sparks from the wires set pieces of paper on fire.

In Boston the offices opened at 8 the next morning, and no business could be done until 8:30. The current on the line to Portland came in waves, each lasting from about 15 seconds to a minute. So both offices cut off their batteries and connected the wire straight to the ground. George Prescott, who ran the Boston office, says they worked on the storm's current alone for more than two hours, between 8:30 and 11. Portland said the signal came through better than with the batteries on.

What a hit would do now

The physics hasn't changed. The wires are longer. At 2:44 AM on March 13, 1989, a smaller storm took down Quebec's whole power grid in less than a minute, and it stayed dark for more than nine hours. In February 2022 a minor storm made the upper air thicker, and 38 of 49 newly launched Starlink satellites came down.

On July 23, 2012, the Sun threw a cloud that hit NASA's STEREO A spacecraft. It crossed Earth's orbit about 121 degrees ahead of us. A week earlier, the region it came from had been facing Earth. The Sun turns, and by then the region had turned away. Daniel Baker, who studied it, judged it at least as strong as 1859.

A 2008 National Academies report includes an estimate that a direct hit could cost 1 to 2 trillion dollars in the first year, with 4 to 10 years to recover. Nobody knows the odds. In 2012 Pete Riley put them at 12% in any ten years. In 2017 Riley and Love got 10.3% on one model and 3.0% on another.

The fastest clouds arrive in 15 to 18 hours, and satellites see them leave the Sun. Then a satellite upstream of Earth detects the shock and gives the last 15 to 60 minutes of warning. During a storm, Hydro Québec reduces the power flowing on its lines and stops major switching. It eases off rather than switching off.

Key numbers

WhatNumberSource
Start of the flare, September 1, 185911:18 Greenwich time, to within 15 secondsCarrington, Monthly Notices of the RAS, 1859
How long the flare lastedabout 5 minutes, ending about 11:23Carrington, Monthly Notices of the RAS, 1859
From the flare to the start of the stormabout 17.5 hours (one estimate: 17.6 hours)Cliver and Svalgaard, 2004
Carrington's sunspot series5,290 observations of 954 groups in 7.5 yearsDictionary of National Biography, Carrington
Telegraph line in the world in 1859about 160,000 to 200,000 km (100,000 to 125,000 miles)Our arithmetic from Green and Boardsen, NASA, 2005
How fast the field changed, September 2 against late Augustabout 500 nT per minute, against no more than 250Beggan and others, Space Weather, 2024
Boston and Portland working without batteriesmore than two hours, between 8:30 and 11 AM on September 2Prescott, 1860
Quebec blackout, March 13, 1989at 2:44 AM the grid went down in less than a minute and stayed dark more than 9 hoursHydro Québec, March 1989 storm
Starlink satellites lost, February 202238 of 49, in a minor stormCIRES, Starlink loss
Estimated cost of a direct hit1 to 2 trillion dollars in the first year, 4 to 10 years to recoverNational Academies, Severe Space Weather Events, 2008
Odds of a Carrington class storm in any ten years, 2017 estimate10.3% on one model, 3.0% on anotherRiley and Love, 2017
Warning timefastest clouds arrive in 15 to 18 hours; final warning 15 to 60 minutesNOAA Space Weather Prediction Center, Coronal Mass Ejections

What the film simplifies

At a glance

Runtime 13 minutes · Topics: Solar storms, Space weather, History of science, Electromagnetic induction · Captions on YouTube · Full script below

Test yourself

  1. On September 2, 1859, how could the Boston and Portland operators send messages with their batteries cut off?

    Answer

    The storm shook Earth's magnetic field, and a moving magnetic field makes a current in a long wire. The storm's current did the battery's job for about two hours, more than two by Prescott's count.

  2. Carrington had the flare and the storm's magnetic record on the same table. Why wouldn't he say one caused the other?

    Answer

    One coincidence isn't proof. In the Society's words, “One swallow does not make a summer.” The flare was first tied directly to the storm in 1937.

  3. A scientist judged the July 2012 cloud at least as strong as 1859's. Why did it miss Earth?

    Answer

    The Sun turns. The region it came from had faced Earth a week earlier but had turned away, so the cloud crossed Earth's orbit about 121 degrees ahead of us.

The script

Read the script

Narrator: A little after midnight, high up in the Rocky Mountains, a party sleeping in the open woke up because it was light out.

Narrator: You could read print by it.

Narrator: They looked at the sky, and they talked it over, and some of them insisted it was daylight.

Narrator: They got up and started breakfast.

Narrator: That same night in New Orleans, some of the fire companies thought part of the city was burning down.

Narrator: That same week, a gentleman there shot three larks at about one o'clock in the morning.

Narrator: They had come out for the day.

Narrator: And the next morning in Boston, in broad daylight, a telegraph operator took the battery off his line, and went on sending messages.

Narrator: All that night, people had looked up from Canada to the Caribbean, and not one of them knew where it came from.

Narrator: One man came close.

Narrator: Seventeen and a half hours before it hit, he saw the flash.

Narrator: And he nearly missed it, because at the biggest moment of his working life, he ran out of the room.

Narrator: In 2012, another one like it came off the Sun.

Narrator: It missed.

Narrator: Richard Carrington was thirty three.

Narrator: His father owned a large brewery at Brentford, and the family plan was for Richard to go into the church.

Narrator: He went up to Cambridge, sat through some lectures on astronomy, and that was the end of the church.

Narrator: He built himself a house on a hill in Surrey with an observatory in it.

Narrator: And on every clear day for years, he pointed a telescope at the Sun, threw the image onto a screen, and drew what he saw.

Narrator: Every spot, by hand.

Narrator: Nobody asked him to.

Narrator: Before he was done it came to 5,290 observations, of 954 groups of spots.

Narrator: Then in the summer of 1858 his father died, and the brewery came to Richard.

Narrator: So that's where we find him.

Narrator: He knows as much about sunspots as nearly anyone alive, and he has a brewery to run.

Narrator: There was one other thing in 1859 that hadn't been around long.

Narrator: More than a hundred thousand miles of telegraph wire had been strung across the world.

Narrator: It worked like this.

Narrator: A battery pushes current down a wire.

Narrator: A man presses a key, and a magnet clicks in a town two hundred miles off.

Narrator: Battery, wire, click.

Narrator: That's the whole machine.

Narrator: Hold on to the battery. We'll want it later.

Narrator: Four nights before that breakfast, on Sunday, August the 28th, the wires went bad.

Narrator: In New York at half past seven, an operator named J.C. Crosson couldn't hold a steady current.

Narrator: He looked out the door, and there were rays of light running down the sky in almost every direction.

Narrator: Up between Quebec and Father Point, good men worked from eight in the evening until one in the morning, trying to get four hundred words across.

Narrator: That's fewer words than you've heard from me so far.

Narrator: They closed the line.

Narrator: In Washington, Frederick Royce was calling Richmond when he leaned toward his machine, and his forehead brushed a wire on the wall.

Narrator: He got, he said, a very severe electric shock.

Narrator: An old man was sitting a few feet away.

Narrator: He said he saw a spark of fire jump from Royce's forehead to the machine.

Narrator: The newspaper doesn't say what the old man did next.

Narrator: By morning it was over.

Narrator: Everybody went back to work.

Narrator: The Sun was ninety three million miles away, and hardly anybody had a reason to look at it.

Narrator: Carrington looked at it every clear day.

Narrator: Thursday, September the 1st, eighteen minutes past eleven.

Narrator: He says he's good to within fifteen seconds.

Narrator: There's a big group of spots on the Sun.

Narrator: Carrington has just finished drawing it, and he's timing the spots against a clock.

Narrator: And two patches of light break out on top of them.

Narrator: He wrote that they were white. Intensely bright and white.

Narrator: We're painting them red, so you can follow them.

Narrator: From here on, red is this thing, and most of the way, nobody could see it.

Narrator: His first thought is that there's a hole in his equipment.

Narrator: He moves the telescope to check.

Narrator: It isn't a hole.

Narrator: He writes down the time.

Narrator: So far, so careful.

Narrator: Then he does what any of us would do.

Richard Carrington: Being somewhat flurried by the surprise, I hastily ran to call some one to witness the exhibition with me.

Narrator: Nearly six years he'd been at that telescope, and he went to get somebody.

Richard Carrington: And on returning within sixty seconds, was mortified to find that it was already much changed and enfeebled.

Narrator: Mortified.

Narrator: That's the word he picked, and he sent it to the Royal Astronomical Society to be printed.

Narrator: It lasted about five minutes. It was the first solar flare anybody ever recorded.

Narrator: He needn't have worried about the witness.

Narrator: At Highgate, north of London, a man named Richard Hodgson happened to be looking at the Sun that same morning, and he saw it too.

Narrator: And Carrington would not write to him to compare notes, so that nobody could say one account had colored the other.

Narrator: Within a few minutes, at the observatory at Kew, a hanging magnet twitched.

Narrator: It kept its own record, a spot of light falling on photographic paper, and the line jumped.

Narrator: Nobody saw it until the paper was developed.

Narrator: The light from the Sun gets here in about eight minutes.

Narrator: So the flash had already arrived.

Narrator: What came behind it takes longer.

Narrator: What left the Sun that morning was a cloud of the Sun itself, billions of tons of it.

Narrator: A cloud like that generally takes days to cross.

Narrator: This one may have had a clear road, because Sunday's storm seems to have swept the way.

Narrator: It would be here in seventeen and a half hours.

Narrator: Nobody knew. So this is the rest of Thursday.

Narrator: Carrington keeps watch for nearly an hour. Nothing else happens. He goes back to his spots.

Narrator: In New York somebody wires the price of something to somebody.

Narrator: In the Rockies it has rained for fifty hours, and around noon it quits.

Narrator: Tonight a party's going to sleep out in the open.

Narrator: While it's coming, here's what it's going to do.

Narrator: The Earth has a magnetic field. It's what turns a compass needle.

Narrator: An Englishman named Michael Faraday had shown twenty eight years earlier that if you move a magnetic field past a wire, you get electricity in the wire.

Narrator: It's how nearly every power plant in the world works today.

Narrator: You don't need a battery. You need a wire and a moving field.

Narrator: The wire's already up, more than a hundred thousand miles of it.

Narrator: The moon's a crescent, and it'll be down before nine.

Narrator: It's going to be a very dark night.

Narrator: In London it's just before five in the morning. In North America it's still Thursday night.

Narrator: When that cloud arrived, the whole field shook.

Narrator: Sunday had been a bad night. This one moved the needle about twice as fast.

Narrator: At Kew the magnet swung so hard that its line ran off the paper again.

Narrator: And the current came down into the wires.

Narrator: In Norway, sparks off the wires set pieces of paper on fire.

Narrator: And this is the one time in this story the red is something you could see for yourself.

Narrator: Blood red, they called it. Deep crimson.

Narrator: It reached the tropics. They saw it along the north coast of Cuba.

Narrator: In Washington, you could read the face of your watch.

Narrator: In the gold country, a paper reported that by half past eleven it began to look like day breaking, and within the hour the stars had gone out.

Narrator: And up in the Rockies, a party got up and started breakfast.

Narrator: In New Orleans, a paper called the Picayune reported it was an indisputable fact that old topers, wholesale consumers of the alcoholic fluid, had fallen dead drunk before they'd had their regular allowance.

Narrator: The paper blamed the sky.

Narrator: Richard Carrington, brewer, might have had another theory.

Narrator: By Friday morning it was broad daylight, and you couldn't see a thing.

Narrator: But when the offices opened at eight, the wires still weren't right.

Narrator: In Washington, the operators found what one paper called a series of electrical currents, entirely independent of the batteries, in possession of the wires.

Narrator: In Boston they couldn't get a thing done until half past eight.

Narrator: The current on their line to Portland, Maine, kept coming and going in waves.

Narrator: So Boston asked Portland to try something.

Boston operator: Please cut off your battery entirely from the line for fifteen minutes.

Portland operator: Will do so. It is now disconnected.

Boston operator: Mine is disconnected, and we are working with the auroral current. How do you receive my writing?

Portland operator: Better than with our batteries on.

Narrator: There are two men, a hundred miles apart, with no battery at all, talking down a wire that's being run by the Sun.

Boston operator: Suppose we work without batteries while we are affected by this trouble.

Portland operator: Very well. Shall I go ahead with business?

Boston operator: Yes. Go ahead.

Narrator: It was as strong a magnetic storm as anyone has ever recorded.

Narrator: The night before, the sky had been red from Canada to Cuba.

Narrator: And what those two men had to say about it was, yes, go ahead.

Narrator: They worked that way for about two hours.

Narrator: I've known men like that. You want them around.

Narrator: Then it faded, and the wires were just wires again. The papers argued about electricity.

Narrator: Carrington had the whole thing in his hands.

Narrator: A flash on the Sun on Thursday morning.

Narrator: A twitch in a magnet at Kew within minutes.

Narrator: And seventeen and a half hours later, the biggest storm anyone had ever seen.

Narrator: That November he stood before the Royal Astronomical Society and showed them his drawing.

Narrator: He told them about the storm too. The Society's notes put what he said like this.

Narrator: While the contemporary occurrence may deserve noting, he would not have it supposed that he even leans towards hastily connecting them.

Narrator: One swallow does not make a summer.

Narrator: He had the flash and he had the storm on the same table, and he wouldn't connect them, because once isn't proof.

Narrator: That's the job done right. It's also hard to watch.

Narrator: Sixteen months later he gave up the sun work.

Narrator: The brewery had won.

Narrator: Today it's named for him. They call it the Carrington Event.

Narrator: He would want it noted that he does not lean towards that.

Narrator: Shake a magnetic field and any long wire fills with current.

Narrator: That hasn't changed.

Narrator: What's changed is the wire.

Narrator: March of 1989. A smaller storm hit, and the whole power grid in Quebec went down in about a minute.

Narrator: Six million people, more than nine hours.

Narrator: February of 2022. SpaceX put up forty nine satellites.

Narrator: A minor storm thickened the air they were flying through, and thirty eight of them came down.

Narrator: And then there's July the 23rd, 2012.

Narrator: The Sun threw another one.

Narrator: A NASA spacecraft happened to be in the way, took it head on, and radioed home.

Narrator: A scientist named Daniel Baker, who studied it, says it was at least as strong as Carrington's.

Narrator: A week earlier, the spot it came from was still facing us.

Narrator: The Sun turns.

Narrator: By that morning it had turned away.

Daniel Baker: The only difference is, it missed.

Narrator: Most newspapers didn't mention it.

Narrator: A National Academy report says a hit like that could cost up to two trillion dollars in the first year.

Narrator: The big transformers it could burn out might take years to repair.

Narrator: One scientist put the odds of another direct hit at about twelve percent in any ten years.

Narrator: He and others have since come in lower, some as low as one percent.

Narrator: Nobody really knows.

Narrator: Nobody can stop one. The Sun doesn't know we're here.

Narrator: We have satellites watching.

Narrator: A fast one might give us most of a day, and the last sure word comes fifteen minutes to an hour out.

Narrator: That's time enough to look at what's on the line, ease off what you can, and keep working.

Portland operator: Shall I go ahead with business?

Boston operator: Yes. Go ahead.

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