The Solar Wind Magnetosphere Ionosphere Link Explorer (SMILE), a satellite developed through a collaboration between China and Europe, has released its first set of scientific images and data, marking its transition into regular science operations. The mission is designed to study how the solar wind interacts with Earth's magnetosphere, the magnetic shield that protects the planet from charged particles streaming from the Sun.
Among the first images is a continuous panoramic view of the aurora borealis, showing its detailed structure over extended periods. Another image captures the glowing remains of a star that exploded approximately 160,000 light-years away. The satellite also collected its first high-resolution measurements of magnetic fields and ions in a highly elliptical Earth orbit. Scientists describe these initial results as highly promising, noting that the data will help researchers better understand how solar activity affects Earth's space environment.
SMILE was launched on May 19 from French Guiana. After about a month of orbital adjustments, it reached its operational orbit on June 20. All instruments were switched on and functioned normally. Calibration was completed, and SMILE began collecting valid data. The mission is the first full, in-depth mission-level collaboration between China and Europe in space science exploration, aimed at unraveling the mysteries of the interaction between the solar wind and Earth's magnetosphere.
The images and data were gathered by four scientific instruments aboard the satellite. SMILE carries the world's first soft X-ray imager (SXI) installed on a spacecraft, capable of turning the previously invisible boundary of the magnetosphere into images. Also on board are an ultraviolet imager (UVI) for the aurora, a light ion analyzer (LIA), and a magnetometer (MAG). Together, these instruments allow simultaneous global-scale imaging of changes in the magnetosphere and direct measurement of solar wind conditions at the satellite's location. This provides scientists with an unprecedented tool to study space weather phenomena such as magnetic storms and substorms.
The SMILE project originated from a cooperation initiative jointly launched by the Chinese Academy of Sciences and the European Space Agency in 2015. It established a equal, mutually beneficial, and complementary cooperation mechanism. China was fully responsible for developing the satellite platform, telemetry and control, ground support, and the realization of scientific application systems, and led the development of the UVI, LIA, and MAG payloads. The European side handled the development of the payload module and the SXI, and provided the launch vehicle, launch site, and telemetry and control support during the active phase.
The release of the first images and data marks a significant milestone for the mission, which aims to deepen understanding of space weather and its effects on Earth's environment. With all instruments operational, SMILE is now positioned to deliver a steady stream of observations that could improve forecasts of magnetic storms and other phenomena that can disrupt satellites, communications, and power grids.
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