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Artists impression of the twin STEREO satellites

The Heliospheric Imager for the NASA STEREO Mission

Part of the SECCHI Consortium

Stereo Ahead is now in Solar Conjunction Operation Mode 1

Welcome

Images of a recent Earth-directed Coronal Mass Ejection (CME) taken by the RAL-led Heliospheric Imager (HI) instruments on the STEREO-A (HI-1A: left hand panel) and STEREO-B spacecraft (HI-1B: right hand panel). This CME, which was launched at around 0 UT on 15 March 2013, resulted in significant auroral activity at Earth. Around this time, the HI instrument on STEREO-B was also observing the passage of Comet C/2011 L4 (PANSTARRS). A plethora of stars, and various planets, are also visible in the HI field of view. A movie can also be downloaded here .

stereo sees comet Panstarrs and a Earth directed coronal mass ejection