The joint European-Chinese SMILE spacecraft has officially begun science operations, delivering unprecedented ultraviolet imagery of a complete auroral oval glowing across both the night and day sides of Earth following its May launch and subsequent commissioning in orbit.
Space operations for the Solar wind Magnetosphere Ionosphere Link Explorer, known as SMILE, were formally cleared to start on September 23 after an in-space commissioning phase that began following its May 19 launch and arrival at its target science orbit on June 20. The joint venture between the European Space Agency and the Chinese Academy of Sciences aims to investigate how charged particles from the Sun interact with Earth’s magnetic environment.
Smile Monitors Northern Polar Region from Elongated Trajectory
Set to study Earth for a three-year duration following its May 19 takeoff, Smile occupies an elongated trajectory soaring approximately 121,000 kilometers (75,000 miles) above the North Pole — roughly one-third of the distance to the moon. This vantage point allows the spacecraft to monitor the northern polar region for a record-breaking 45 hours at a time.
The spacecraft’s diagnostic period tested its four primary instruments: the Ultraviolet Aurora Imager, the soft X-ray imager, the magnetometer, and the light ion analyser. Researchers will use data gathered by every onboard instrument to examine solar storms, geomagnetic activity, and space weather dynamics. While the Ultraviolet Aurora Imager demonstrated immediate success, engineers encountered technical hurdles with the soft X-ray imager. Ground controllers need to perform additional calibration on the camera because its detector still absorbs an excess of light when directed toward our planet, even though the hardware functions properly.
Ultraviolet Imaging of Daytime Auroras
The mission released its first milestone footage captured by the Ultraviolet Aurora Imager on July 24, just two weeks after the instrument was activated. The camera represents the first hardware capable of imaging the entire northern auroral oval in ultraviolet light since 2008. The resulting time-lapse imagery reveals a serpent-like ring of auroral activity coiling around the North Pole during daylight hours, capturing atmospheric phenomena typically masked by solar glare.
Produced in July 2026, these ultraviolet views display a massive, serpentine band of energetic particles winding around the North Pole. The observations demonstrate the turbulence and variability of solar wind interactions across both the day and night sides of the planet. By continuously tracking the complete auroral oval over extended periods, researchers can connect dynamic changes in Earth’s magnetosphere with the resulting auroral displays glowing below.
Space Weather Research Goals
Data gathered by SMILE will support ongoing research into solar storms, geomagnetic disturbances, and space weather phenomena. Understanding how solar wind energy enters the magnetosphere helps scientists evaluate potential risks to astronauts, orbital satellites, and ground-based electrical infrastructure. Spanning the critical window from June 2024 through May 2026, a new documentary highlights how Smile transformed from scattered components into a fully operational science observatory in just over two years.
| Mission Element | Responsible Agency | Key Contribution |
|---|---|---|
| Payload Module & SXI | ESA | Carries three science instruments and the soft X-ray imager |
| Spacecraft Platform & Operations | CAS | Provides platform and overall orbital operations |
| Ultraviolet Imager (UVI) | Joint Collaboration | Continuous 45-hour auroral monitoring |
The mission structure divides responsibilities between the two major space agencies. The European Space Agency and the Chinese Academy of Sciences are joint partners in the mission.
“The Smile mission is a testament to the trust built between our teams, their dedication to excellence and their determination to find solutions whatever the challenge,”
Professor Carole Mundell, ESA Director of Science