From a weather experiment to continuity

Meteosat began as a French initiative and developed into a European project through ESRO, the predecessor of ESA. Meteosat-1 launched on November 23, 1977, and returned its first image on December 9. From geostationary orbit, it could repeatedly observe a broad region rather than wait for a low-orbiting satellite to return on another pass.

A single cloud image records a pattern. A sequence can reveal movement and development. In an original forecasting exercise, two images show a cloud feature in different locations; the comparison is useful only if their times and geographic alignment are known. Repeated observations help turn a striking picture into evidence about changing weather.

The first generation ultimately comprised seven spacecraft. Meteosat 2, launched in 1981, continued the early observational effort; its image of Cyclone Gista shows the kind of weather structure this record preserved. The picture is an observation made by the satellite, not a photograph of the satellite itself.

A demonstration can succeed with one useful image, but a weather service needs the next image and the one after that. In an original continuity exercise, a functioning instrument is insufficient if its data cannot be received, processed or distributed. Ground systems, replacement plans and operating responsibility are part of the mission requirement.

EUMETSAT’s history describes the European decision to create a specialized operational organization for long-term continuity. Control of the orbiting Meteosat satellites passed to EUMETSAT on November 15, 1995. This was an institutional and operational handover, not the date of the first Meteosat launch.

Keep development history, ownership or operating responsibility, and individual spacecraft service periods separate. This course covers Meteosat First Generation’s 1977–2017 program record. Second and Third Generation systems continue the wider weather-observation effort, but their instruments and capabilities should not be retroactively assigned to the original spacecraft.