Earth’s thermosphere reaches highest temperature in 20 years after being bombarded by solar storms

Published

2 years ago

June 23, 2023

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A vibrant aurora display during a geomagnetic storm. (Image credit: Shutterstock)

Earth’s thermosphere recently hit a near 20-year temperature peak after soaking up energy from geomagnetic storms that bashed Earth this year. The temperature in the second-highest layer of the atmosphere will likely continue to climb over the next few years as the sun’s activity ramps up, which could impact Earth-orbiting satellites, experts warn.

The thermosphere extends from the top of the mesosphere, at around 53 miles (85 kilometers) above ground, to the bottom of the exosphere, which begins at around 372 miles (600 km) above the ground, according to NASA. Beyond the exosphere is outer space.

For more than 21 years, NASA has measured the thermosphere temperature via infrared radiation emitted by carbon dioxide and nitric oxide molecules. Scientists convert data collected by NASA’s Thermosphere, Ionosphere, Mesosphere, Energetics and Dynamics (TIMED) satellite, into the Thermosphere Climate Index (TCI), which is measured in terawatts, or TW. (1 TW is equal to 1 trillion watts.)

The TCI value, which spiked on March 10, peaked at 0.24 TW, Martin Mlynczak, a leading researcher on the TIMED mission at NASA’s Langley Research Center in Virginia and creator of the TCI, told Live Science. The last time the TCI was this high was Dec. 28, 2003. (The temperature spike data has been submitted to a journal but has not yet been peer-reviewed.)

Related: 10 solar storms that blew us away in 2022

The temperature spike was caused by three geomagnetic storms in January and February — major disturbances to Earth’s magnetic field that are triggered by chunks of fast-moving magnetized plasma, known as coronal mass ejections (CMEs), and less often by streams of highly charged particles, known as solar wind, which are both spat out by the sun.

“These ‘storms’ deposit their energy in the thermosphere and cause it to heat up,” Mlynczak said. “The increased heating results in increased levels of infrared emission from nitric oxide and carbon dioxide in the thermosphere.” Normally, infrared emissions after a storm cool the thermosphere, he added, but when the storms come back to back the temperature stays high.

Since the spike, at least two more geomagnetic storms have hit our planet — one on March 24, which was the most powerful solar storm to hit Earth for more than six years, and another equally powerful storm on April 24. The TCI values following these storms have remained high but have not yet passed the March peak, Mlynczak said.

A graph showing how the TCI value rises and falls with each solar cycle. (Image credit: Marty Mlynczak (NASA Langley Research Center) and Linda Hunt (Science and Technology Corporation))

Geomagnetic storms become more frequent and intense during solar maximum, a part of the roughly 11-year solar cycle in which the sun is most active and covered in dark sunspots and plasma loops that spit out CMEs and solar wind.

As a result, Earth’s thermosphere also follows a roughly 11-year cycle, Mlynczak said. Government scientists from NASA and NOAA predicted the next solar maximum will arrive in 2025, which means the warming trend will likely continue over the next few years.

Changes to the thermosphere can pose challenges for satellites in low-Earth orbit that are positioned around the thermosphere’s upper boundary, Mlynczak said.

“The thermosphere expands as it warms,” Mlynczak said, resulting in “increased aerodynamic drag on all satellites and on space debris.” This increased drag can pull satellites closer to Earth, he said, which could cause satellites to crash into one another or completely fall out of orbit, as SpaceX Starlink satellites did in February 2022 after a surprise geomagnetic storm.

Satellite operators can avoid these issues by positioning their spacecraft in a higher orbit when needed, but the unpredictability of space weather makes it hard to know when these manoeuvres are required until it is often too late.related stories—Hidden tide in Earth’s magnetospheric ‘plasma ocean’ revealed in new study

—Mysterious aurora-like phenomenon ‘STEVE’ appears during strongest solar storm for more than half a decade

—Powerful X-class flare spat out a rare ‘solar tsunami,’ and you can hear it smashing into Earth

Solar maximum could also arrive sooner than predicted. A recent study published Jan. 30 in the journal Frontiers in Astronomy and Space Sciences suggests that the solar activity peak could arrive as early as late 2023 and be more powerful than initially predicted. If this scenario plays out, then the risk of a satellite disaster further increases.

However, over longer timescales, temperatures in the thermosphere are declining, because excess CO2 in the thermosphere due to climate change increases infrared emissions into space, a May 8 study in the journal Earth Atmospheric and Planetary Sciences found.

Politics

Starmer ran the gauntlet with Trump but just about emerged intact

Published

2 hours ago

July 28, 2025

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Starmer ran the gauntlet with Trump but just about emerged intact

When TV cameras are let in to film world leaders meeting in person, the resulting footage is usually incredibly boring for journalists and incredibly safe for politicians.

Not with Donald Trump.

Sir Keir Starmer ran the gauntlet on Monday.

Trump latest: President treats PM to a ride on Air Force One

Put through a total of almost 90 minutes of televised questioning alongside the American leader, it was his diciest encounter with the president yet.

But he still just about emerged intact.

For a start, he can claim substantive policy wins after Trump announced extra pressure on Vladimir Putin to negotiate a ceasefire and dialled up the concern over the devastating scenes coming from Gaza.

There were awkward moments aplenty though.

Top of the list is Mr Trump’s trashing of the prime minister’s Labour colleague, London mayor Sir Sadiq Khan.

But more important than that, Monday’s meeting was the clearest representation of the political gulf that separates the two leaders.

“He’s slightly more liberal than me,” Mr Trump said of Sir Keir when he arrived in Scotland.

What an understatement.

On green energy, immigration, taxation and online regulation, the differences were clear to see.

Sir Keir just about managed to paper over the cracks by chuckling at times, choosing his interventions carefully and always attempting to sound eminently reasonable.

At times, it had the energy of a man being forced to grin and bear inappropriate comments from his in-laws at an important family dinner.

But hey, it stopped a full Trump implosion – so I suppose that’s a win.

My main takeaway from this Scotland visit though is not so much the political gulf present between the two men, but the gulf in power.

Sir Keir flew the length of the country he leads to be the guest at the visiting president’s resort.

He was then forced to sit through more than an hour of uncontrolled, freewheeling questioning from a man most of his party and voters despise, during which he was offered unsolicited advice on how to beat Nigel Farage and criticised (albeit indirectly) on key planks of his government’s policy platform.

In return he got warm words about him (and his wife) and relatively incremental announcements on two foreign policy priorities.

So why does he do it?

Because, to borrow a quote from a popular American political TV series: “Air Force One is a big plane and it makes a hell of a noise when it lands on your head.”

World

Israeli human rights organisations accuse country of genocide

Published

2 hours ago

July 28, 2025

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Israeli human rights organisations accuse country of genocide

Two Israeli human rights organisations have said the country is committing genocide against Palestinians in Gaza.

In reports published on Monday, B’Tselem and Physicians for Human Rights (PHR) said Israel was carrying out “coordinated, deliberate action to destroy Palestinian society in the Gaza Strip”.

The two groups are the first major voices within Israeli society to make such accusations against the state during nearly 22 months of war against Hamas.

Israel has vehemently denied claims of genocide. David Mencer, a spokesperson for the government, called the allegation by the rights groups “baseless”.

He said: “There is no intent, (which is) key for the charge of genocide… it simply doesn’t make sense for a country to send in 1.9 million tonnes of aid, most of that being food, if there is an intent of genocide.”

B’Tselem director Yuli Novak called for urgent action, saying: “What we see is a clear, intentional attack on civilians in order to destroy a group.”

The organisation’s report “is one we never imagined we would have to write,” Ms Novak said. “The people of Gaza have been displaced, bombed, and starved, left completely stripped of their humanity and rights.”

PHR said Israel’s military campaign shows evidence of a “deliberate and systemic dismantling of Gaza’s health and life-sustaining systems”.

Both organisations said Israel’s Western allies were enabling the genocidal campaign, and shared responsibility for suffering in Gaza.

“It couldn’t happen without the support of the Western world,” Ms Novak said. “Any leader that is not doing whatever they can to stop it is part of this horror.”

Hamas said the reports by the two groups were a “clear and unambiguous testimony from within Israeli society itself regarding the grave crimes perpetrated by the occupation regime against our people”.

Dire humanitarian conditions

Since Israel launched its offensive in Gaza following the deadly Hamas attack on 7 October 2023, nearly 60,000 people – mostly civilians – have been killed, according to Gaza health officials.

Much of the infrastructure has been destroyed, and nearly the whole population of more than two million has been displaced.

An increasing number of people in Gaza are also dying from starvation and malnutrition, according to Gaza health authorities.

On Monday, the Gaza health ministry reported that at least 14 people had died from starvation and malnutrition in the past 24 hours, raising the total number of hunger-related deaths during the war to 147.

Among the victims were 88 children, with most of the deaths occurring in recent weeks.

UN agencies say the territory is running out of food for its people and accuse Israel of not allowing enough aid deliveries to the enclave. Israel denies those claims.

Israeli Prime Minister Benjamin Netanyahu on Sunday said “there is no starvation in Gaza” and vowed to fight on against Hamas.

US President Donald Trump said on Monday that many in Gaza are facing starvation and implied that Israel could take further steps to improve humanitarian access.

Israel has repeatedly said its actions in Gaza are in self-defence, placing full responsibility for civilian casualties on Hamas. It cites the militant group’s refusal to release hostages, surrender, or stop operating within civilian areas – allegations that Hamas denies.

UK

Two killed in stabbing at business premises in London

Published

2 hours ago

July 28, 2025

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Two killed in stabbing at business premises in London

Two men have died after a stabbing in central London.

Police were called to a business premises in Long Lane, Southwark, at 1pm on Monday, where they found four people had been stabbed.

A 58-year-old man died at the scene while three others were taken to hospital, the Metropolitan Police said. These included a 27-year-old man who has since died.

A third man, who is in his thirties, remains in hospital with injuries described as non-life-threatening.

Another man in his thirties, who has been detained in connection with the incident, remains in a life-threatening condition in hospital.

Detective Chief Superintendent Emma Bond said: “Our investigation is in the early stages and we are working hard to understand the full circumstances of this shocking incident.

“At this point, we do not believe it to be terrorism-related and there is no further risk to the public.”