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
STEREO Ahead spacecraft is in "safe mode" moving in superior solar conjunction. Communications with the STEREO Behind spacecraft were interrupted on 1 October 2014.
The information on this web page was outdated and removed.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.
SOHO | Space Weather | Aurora
STEREO Science Center at NASA, stereo-ssc.nascom.nasa.gov