What is a solar flare?

A solar flare is characterized as a sudden and intense brightening on the Sun's surface. This phenomenon occurs when magnetic energy that has built up in the solar atmosphere is released. It manifests as a burst of radiation across the electromagnetic spectrum, including X-rays and UV light. Solar flares can last from a few minutes to several hours and are often associated with other solar activities such as sunspots and coronal mass ejections.

This brightening can increase solar radiation that reaches Earth and can disrupt satellite communications, navigation systems, and power grids. The intense energy released during a solar flare can be several times greater than that of a nuclear bomb, highlighting its significance in solar dynamics and space weather.

In contrast, the other options describe different solar phenomena or characteristics that do not align with the definition of a solar flare.