Lightning and Its Impact on Energy Waves in Space

By Jurassic JennAug 23, 2024 14:08 PMScience
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Lightning and Its Impact on Energy Waves in Space
Lightning . Source: Science | HowStuffWorks

Lightning strikes near Earth's surface generate electromagnetic waves known as "whistlers." These waves are capable of traveling significant distances into space, reaching altitudes that might jeopardize satellites and astronaut safety.

Researchers investigated how lightning enables energy to ascend into the upper layers of the atmosphere. Whistlers, which can transform into sound signals, were previously thought to remain below 1,000 kilometers from Earth’s surface. However, findings from Vikas Sonwalkar and Amani Reddy at the University of Alaska Fairbanks reveal a crucial aspect: whistlers can reflect off the ionosphere, allowing these waves to ascend up to 20,000 kilometers. This phenomenon explains their presence deep in the magnetosphere, where Earth's magnetic field is predominant.

The researchers uncovered evidence of reflected whistlers using data from the Van Allen Probes, twin robotic spacecraft that examined the magnetosphere from 2012 to 2019. Additionally, early research from the 1960s includes signatures pointing to this consistent occurrence. Reddy notes that both historical and recent data indicate that this mechanism happens frequently.

Interestingly, the researchers propose that lightning could supply double the energy to the magnetosphere than previously estimated. This generated energy may accelerate nearby particles, producing radiation capable of damaging satellites and impacting astronaut health.

Historically, lightning has been underestimated in terms of its influence. Jacob Bortnik from the University of California, Los Angeles, emphasizes the significance of recent data, stating that a more detailed examination invites further research into magnetosphere dynamics.

Moreover, linking lightning activity to the magnetosphere grows increasingly relevant as climate change may enhance lightning-related storms. Moving forward, the research team aspires to analyze additional satellite data to deepen understanding of how lightning-based whistlers fill the magnetosphere and their potential responses to space weather.

Earlier, SSP reported that ancient DNA revealed indigenous dog lineages at Jamestown, Virginia.

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