Solar and Heliospheric Observatory
- ESA space mission to examine the Sun’s oscillations and luminosity, the solar wind, and the outer layers of the Sun. SOHO was launched in 1995, carrying 12 instruments, and sited at the first Lagrangian point of the Earth/Moon system, from which the Sun is always visible. The SOHO satellite is intended to work closely with ESA’s cluster satellites for examining the Earth’s geomagnetic field. Its main objectives were to examine the solar interior, the Sun’s atmosphere and the solar wind. It obtained information about the solar interior by measuring the oscillations of the Sun’s photosphere, its visible surface, caused by sound waves in the Sun’s interior.