What is a coronal mass ejection?

A coronal mass ejection (CME) is a massive burst of plasma and magnetic field released from the Sun's corona into space. These eruptions can release up to billions of tons of matter at speeds of up to several million miles per hour.

CMEs are often associated with solar flares and other solar activity, and can have a significant impact on space weather and the Earth's magnetosphere. When a CME reaches Earth, it can cause geomagnetic storms that can disrupt power grids, communication systems, and satellites.

Coronal mass ejections are caused by the release of magnetic energy stored in the Sun's corona. The energy is released in the form of a CME when the magnetic field lines reconnect, releasing a massive burst of plasma and magnetic field into space.

Scientists study coronal mass ejections to better understand the Sun's magnetic field and its effects on space weather. The study of CMEs is also important for predicting and mitigating the impact of space weather events on Earth.