Italian astronaut Paolo Nespoli captured this beautiful aurora display as the ISS passed over the Southern Hemisphere. The display's vibrant colors lit up the southern sky as the Antarctic Circle was just emerging from the long winter night. While Nespoli took the video on Aug. 20, the European Space Agency (ESA) released it on Sept. 15.
The brilliant displays of color are generated by charged particles from the solar wind. Earth's magnetic field channels these particles to the northern and southern latitudes. When the particles hit molecules in the atmosphere, the air glows like a neon light. [In Photos: Amazing Aurora Views from Space]
The sun has been quite active lately, even though it's entering the winter of its 11-year cycle. This aurora comes on the heels several powerful solar flares earlier this month, including one on Sept. 6 that was the strongest solar blast in 12 years.These bursts of high-energy particles often add extra flair to the auroras, but they can play havoc with satellites, telecom cables and power lines.
For the Aug. 20 video, Nespoli compressed roughly 15.5 minutes of videography into a dazzling, 37-second time-lapse piece. Nespoli's camera took 919 images per second to record the view, ESA officials wrote in a video description.
Another aurora video, captured by Nespoli on Sept. 18 and released on Sept. 23, showcases the brilliant green celestial light dancing over city lights as the space station soared overhead.
The ISS has plenty of windows for astronauts to catch shows like this, but the seven, Earth-facing windows of the Cupola offer the crew exceptional views of the auroras as they zoom overhead at nearly 5 miles (8 kilometers) per second. The space station traveled nearly 4,370 miles (7,030 km), roughly the distance from Washington, D.C., to Rome, over the course of the latest video.
Nespoli is one of six astronauts and cosmonauts currently living aboard the ISS on the Expedition 53 mission. He launched to the station in July and will return to Earth in December.