CME Arcades

This image shows the dynamic time scale of post-CME arcades. The sequence is from the Yohkoh Soft X-ray Telescope, and shows a beautiful magnetic arcade (“row of arches”) created by the rapid restructuring of the coronal magnetic field. Such arcades, made visible in X-rays by the million-degree plasma that is confined in the magnetic loops, are one of the signatures that a coronal mass ejection (CME) has occurred. This event occurred on Feb. 26, 1992.