Extreme Space Weather
posted: Feb 17, 2011 - 14:30UT - 15:30LT
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These are images of the solar corona by the SECCHI outer Heliospheric Imager (HI-2) on the STEREO Behind Observatory. They are produced with the beacon data, i.e. the image quality is far lower than in the final science product.
Based on these images, we estimate the speed of the shockfront to be 500 km/s.

The latest estimate for the arrival time is: February 18, 6UT.