Scientists finally solve the mystery of a strange whitish-grey patch spotted in the northern lights

Images of the aurora borealis displaying the structured continuum emission. (Image: Courtesy Faculty of Science research team)

A new discovery has unveiled the origin of a strange whitish-grey patch seen with the northern lights. This phenomenon, now termed a "structured continuum emission," offers fresh insight into the aurora borealis’ complexities.

Aurora's Hidden Companion
The unusual pale patch often appears alongside dynamic auroras. Dr Emma Spanswick, a physics professor at the University of Calgary, led the study. “This patch is intricately linked with the aurora,” she explained. Researchers have now confirmed it is a heat source, making the aurora even more complex.

While previously noted in scientific records, its nature remained a mystery. Published in Nature Communications, the study marks the first clear explanation.

Role of Advanced Camera Technology
The discovery relied on cutting-edge camera sensors capturing true-colour images. Dr Spanswick highlighted how advancements in digital photography have benefited science. “Modern sensors, now commercially available, help identify such celestial phenomena,” she said.

The team also drew connections to STEVE, another sky phenomenon. Unlike STEVE’s separate mauve ribbon, this patch blends into auroras.

Student Involvement Sparks Future Research
Three University of Calgary students contributed significantly to this study. Undergraduate Josh Houghton played a key role in data analysis. “It was an incredible learning experience,” he said. Houghton will continue this research as part of his honours thesis and future master’s degree.

This finding highlights how collaboration and technology advance our understanding of cosmic mysteries.