Experimental NASA research models, based on observations from NASA’s Solar Terrestrial Relations Observatory, show that the CME left the Sun at speeds of around 570 miles per second (920 km/s), which is a fairly typical speed for CMEs.
Earth-directed CMEs can cause a space weather phenomenon called a geomagnetic storm, which occurs when they funnel energy into Earth’s magnetic envelope, the magnetosphere, for an extended period of time. The CME’s magnetic fields peel back the outermost layers of Earth’s fields, changing their very shape. In the past, geomagnetic storms caused by CMEs of this strength have usually been mild.
Magnetic storms can degrade communication signals and cause unexpected electrical surges in power grids. They also can cause aurorae.