Between 4 and 6 September, NASA’s Solar Dynamics Observatory spacecraft captured extreme ultraviolet images of a large, well-developed “hole” in the Sun’s corona followed by the formation of another, larger hole nearby. Coronal holes are dark, cooler regions of the Sun’s outer atmosphere associated with open magnetic field lines where electrically charged particles making up the solar wind readily stream out into space. Brighter areas in this view are regions where magnetic activity is strong.
Our Sun is a volatile star, producing giant clouds of solar particles called coronal mass ejections. Now scientists may finally have a tool to predict the magnetic configuration of a CME from afar, enabling forecasters to give utility grid and satellite operators a day’s advance warning to protect their systems.