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Just prior to this, an X-class solar flare had been recorded near the center of the solar disk by the spacecraft's Extreme-ultraviolet Imaging Telescope (EIT), observing the Sun in Fe XII at 195 Angstroms. In other words, the halo event was heading for Earth.
We have collected some of the images and movies from this spectacular event, including "observations" of the torrent of energetic particles that arrived about half an hour later. Such particle storms cause snow on the images as the cameras' electronic detectors are bombarded with high-energy particles.