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When lightning bolts collide, do they unleash highly effective gamma-ray flashes?

May 23, 2025
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When lightning bolts collide, do they unleash highly effective gamma-ray flashes?
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Essentially the most highly effective explosions within the identified universe come from what are often called gamma-ray bursts — although they might not sound notably thrilling, scientists often talk about these unimaginable blasts of electromagnetic radiation in the identical breath as large collapsing stars and black holes.

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We have catalogued fairly just a few of those occasions because the Sixties, and even used them to assist us perceive extra about galaxy superclusters, however one explicit sort of gamma-ray burst has remained considerably of a thriller. It is known as a terrestrial gamma-ray flash (TGF), and it erupts inside thunderstorms on Earth lots of of ft above our heads.

Yuuki Wada, a professor at Osaka College in Japan, has been learning TGFs for years. He is the lead writer on a brand new examine that examines the mysterious relationship between TGFs and lightning bolts — and, in keeping with this examine, scientists have noticed a TGF synchronized with a lightning discharge that arose from a collision of leaders, which information lighting movement, coming from reverse instructions.


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“TGFs are one of the vital energetic pure phenomena within the ambiance,” Wada instructed House.com. Wada’s work focuses on high-energy phenomena in lightning flashes and thunderclouds.

To assemble knowledge about lightning for examine, the staff traveled two hours north of Osaka to the seaside metropolis of Kanazawa, positioned in Ishikawa Prefecture on the Northern coast of Honshu, Japan’s major island.

“We ready an commentary community round tv transmission towers in Kanazawa,” Wada stated. The researchers used a “state-of-the-art multi-sensor setup “that might detect optical, radio-frequency and high-energy radiation.

The multi-sensor observations they carried out had been a world first, senior writer Harufumi Tsuchiya said in an announcement, and that the mix of sensors helped them be taught extra concerning the mechanism for TGFs.

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Nevertheless, conducting the analysis for the examine was difficult — and Wada stated it required a little bit of luck — because the examine relied on having the ability to observe lightning bolts in motion. “Lightning is tough to foretell now,” Wada stated. “So, there’s a danger of performing intensive observations as a result of detection ranges are restricted.”

“There was a danger that we’d detect nothing,” Wada added. “Happily, we detected a TGF with the complete community.”

Gamma-ray flashes in thunderstorms

Scientists know thunderstorms emit very quick TGFs, in addition to longer gamma-ray flashes, which might final from minutes to hours. However thunderstorms nonetheless maintain their share of mysteries.

The robust currents of air in thunderstorms may cause air and water to shoot up and down in a short time. When this occurs, crystals of ice start to collide contained in the air currents, inflicting them to shed electrons and generate a lightning-producing electrical subject.

Whereas scientists suppose that, below particular situations, TGFs come up from discharges of lightning throughout thunderstorms, they nonetheless do not perceive the precise relationship between the 2.

“TGFs have been largely detected by satellites, and a element of how lightning produces gamma rays stays a thriller,” Wada stated. “Our ground-based commentary provides us a clue to grasp TGFs.”

Utilizing the sensors on the transmission towers, the researchers caught a snapshot of lightning discharges alongside two paths. One path got here from the thundercloud and led all the way down to a transmission city. The opposite path ascended in the wrong way.

The researchers noticed the TGF proper earlier than the 2 discharge paths converged and created a extremely concentrated electrical subject that the researchers say accelerated the electrons capturing by means of the air to close gentle velocity.

One second incorporates a million microseconds. The staff recorded the primary photon of the TGF simply 31 microseconds earlier than the paths met. The total burst lasted 20 microseconds after the paths fashioned a lightning strike.

This new examine follows earlier work delving into TGFs from quite a lot of scientific organizations, together with NASA and European House Company (ESA). In August 2023, NASA pilots flew into thunderstorms aboard a high-altitude science plane to assemble knowledge on TGFs.

In Could 2019, ESA created the first-ever picture of a TGF, which arose from a thunderstorm over the island of Borneo, in Southeast Asia. To review the TGFs, they used a particular observatory aboard the Worldwide House Station.

The work to grasp TGFs is much from completed. “The relation between lightning and TGF will not be clear,” Wada says. “That’s the reason we’re persevering with this examine.”

“We’re concentrating on winter thunderstorms in Japan,” he added. “As a result of they’ve uncommon options in comparison with different thunderstorms, akin to decrease cloud bases, we anticipate extra mysteries shall be resolved by observations in Japan.”

The study was revealed on Could 21 within the journal Science Advances.



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