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Cosmic rays may hold key to unlocking mystery of lightning

01 April 2025 06:34

For years, scientists have been puzzled by what exactly triggers the powerful flashes of lightning that light up thunderstorms. Now, new research suggests that the answer may lie not in Earth's atmosphere, but in the cosmos.

A groundbreaking study from Los Alamos National Laboratory points to cosmic ray showers—bursts of high-energy particles from space—as the missing spark behind lightning.

Despite the fact that lightning strikes the Earth approximately 3 million times a day, the exact mechanism that triggers these electrical discharges remains a mystery. Previous theories, such as the idea that a strong electric field inside storm clouds causes lightning, have been challenged by new findings. Researchers led by Xuan-Min Shao observed that the direction of the lightning’s electrical current does not align with the cloud’s electric field, suggesting that another force may be at work.

The study proposes that cosmic ray showers—caused by high-energy particles from distant supernovas, black holes, and even the Sun—could be responsible for triggering lightning. When these cosmic rays collide with air molecules in Earth’s upper atmosphere, they produce a cascade of exotic particles, including positrons, which could play a role in lightning's unpredictable path.

While exciting, the discovery is just the beginning. The team aims to gather more data and establish a direct link between lightning strikes and cosmic ray showers, an elusive task given the difficulty of detecting cosmic ray impacts in real time.

Future research could even shed light on the relationship between the solar cycle and lightning frequency, as cosmic rays vary depending on the Sun’s activity. With further observations, scientists hope to finally unravel the mysteries of one of nature’s most powerful forces.

Caliber.Az
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