The SOHO spacecraft was designed to observe the Sun. For this, it was placed in orbit around the Earth at the Lagrange point L1 between the Earth and the Sun about one and a half million kilometers from Earth.
This position allows SOHO to observe continuously. SOHO is equipped with sensors of various wavelengths and a coronagraph that allows it to observe the solar corona that we see on Earth during solar eclipses. Opposite an image of a jet emitted by the Sun. We also distinguish two comets rushing on the Sun.
Here, an animation showing solar activity (credit: SOHO).
Here an animation of the launch of the SOHO spacecraft (credit ESA).
Here, an animation showing the transit of Mercur near Sun (credit SOHO).