coronal

Earlier models suggested the heating that causes coronal rain should take hours or even days, yet solar flares occur within minutes.

Data from the Ulysses spacecraft showed that the fast solar wind originates mainly from vast coronal holes near the poles.

The heightened chance of a UK sighting has been caused by a fast-moving coronal mass ejection, which is a "release of plasma and magnetic field from the Sun's corona", late on Saturday night.

The most vivid auroras occur when the Sun emits large clouds of particles called coronal mass ejections.

During this phase there is an increase in the number of eruptions from the Sun, including solar flares and coronal mass ejections.