Solar TErrestrial RElations Observatory (STEREO) consists of two nearly identical space-based observatories - one ahead of Earth in its orbit, the other trailing behind. Its mission is to provide the first-ever stereoscopic measurements to study the Sun and the nature of its coronal mass ejections.
Image plot of current position of two STEREO spacecrafts relative to the Sun and Earth.
STEREO positions plot
The information on this web page was outdated and removed. The web page will be active, when STEREO spacecrafts and their instruments become operational again after exiting the superior solar conjunction (January 2016).