The European Space Agency's upcoming mission, Smile, is set to launch in 2026, aiming to image Earth's magnetic shield and study its response to solar radiation. This mission, a joint venture with the Chinese Academy of Sciences, will spend years in a highly elliptical orbit, capturing X-ray and ultraviolet images. However, the operational satellite warning of solar storms, SOHO, is a 1995 spacecraft that has been running 28 years past its retirement, highlighting the gap between discovery science and operational continuity within the agency.
The article delves into the contrasting nature of these missions. Smile, a discovery satellite, is built for the scientific community and serves the interests of principal investigators, instrument teams, and graduate students. Its launch is well-publicized and has a clear scientific yield. On the other hand, SOHO, the operational sentinel, serves a different set of users, including grid operators, airline dispatchers, and satellite fleet controllers. These users, who rely on SOHO's data for critical infrastructure protection, do not actively lobby for new satellites.
The author argues that the ease of funding discovery missions compared to operational satellites is a structural issue. Discovery missions have a clear launch date, press kit, and scientific yield, making them more appealing to funding agencies. Operational satellites, on the other hand, have a maintenance schedule and unglamorous risk register, making them less attractive. This asymmetry has led to a fleet of rich discovery instruments and thin operational sentinels over the years.
The article also addresses the technical claim that Smile is not a replacement for SOHO and that the operational gap is being addressed. The author emphasizes that the replacement satellite, NOAA's SWFO-L1, is designed to take over the operational role, and ESA's Vigil mission will provide a new vantage point. However, the urgency of replacing SOHO was only emphasized when the replacement was finally on the pad, indicating a delay in addressing the operational gap.
The author concludes by questioning the institutional incentives that decide which spacecraft get built. The ease of funding discovery missions compared to operational satellites raises concerns about the physical safety of those whose lives depend on the operational satellites. The article highlights the need to address this structural issue and the importance of maintaining operational continuity in space exploration.
