New research sheds light on the formation of lightning, a phenomenon that has intrigued people for ages. A team of engineers and meteorologists, led by Victor Pasco from Penn State University, utilized advanced mathematical models to uncover the processes occurring at cloud tops that generate lightning. Their findings, published in the Journal of Geophysical Research, reveal that within storm clouds, powerful electric fields accelerate electrons, leading to the production of X-rays and high-energy photons associated with lightning strikes.
By comparing their upgraded models with data from field observations—gathered through ground sensors, satellites, and reconnaissance planes—the researchers focused on terrestrial gamma-ray flash (TGF) events linked to lightning. They found that electrons in thunderstorms emit X-rays, which interact with nitrogen and oxygen in the atmosphere, spawning a chain reaction that results in bursts of energy traveling through the sky.
The new model enhances understanding of the varied intensity of lightning events and explains phenomena like “optical dim and wireless silent” TGFs. Unlike previous studies that focused on localized areas, this model provides a comprehensive simulation applicable to different altitudes and observed events.
Pasco emphasized that although the mathematics involved is complex, the foundational concepts are straightforward and intuitive. This approach, using simple starting points for complex calculations, has proven effective in advancing the understanding of lightning and related atmospheric phenomena.
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