ESA Science & Technology - SOHO
SOHO (SOlar Heliospheric Observatory) is a space-based observatory, viewing and investigating the Sun from its deep core, through its outer atmosphere - the corona - and the domain of the solar wind, out to a distance ten times beyond the Earth's orbit.
SOHO's pioneering 25 years in orbit
2 December 2020
The ESA-NASA Solar and Heliospheric Observatory (SOHO) is celebrating its twenty-fifth launch anniversary.
The discovery of Comet SWAN by solar-watcher SOHO
13 May 2020
Currently crossing the skies above Earth, Comet C/2020 F8 (SWAN) has the potential to become a more prominent naked eye object by late May or early June. Yet it wasn't discovered by someone looking up at the night sky.
Earth's atmosphere stretches out to the Moon – and beyond
20 February 2019The outermost part of our planet's atmosphere extends well beyond the lunar orbit – almost twice the distance to the Moon.
Tracking a solar eruption through the Solar System
15 August 2017Ten spacecraft, from ESA's Venus Express to NASA's Voyager-2, felt the effect of a solar eruption as it washed through the Solar System while three other satellites watched, providing a unique perspective on this space weather event.
Gravity waves detected in Sun's interior reveal rapidly rotating core
1 August 2017Scientists using the ESA/NASA SOHO solar observatory have found long-sought gravity modes of seismic vibration that imply the Sun's core is rotating four times faster than its surface.