flare

Flare is a term used in several fields to denote a sudden bright emission of light or energy. The most widely known senses are astronomical flares, devices used for signaling or illumination, medical flare-ups, and the fashion term flared trousers.

In astronomy, a solar flare is a rapid release of magnetic energy from the Sun's atmosphere, producing radiation across the spectrum from radio waves to X-rays. Flares on other stars, called stellar flares, are analogous but can be orders of magnitude more energetic. Flares are linked to magnetic reconnection, often near sunspots, and can affect space weather, satellite operations, and radio communications on Earth.

Lens flare is an optical artifact caused by bright light scattering inside a camera lens; it can create halos, rings, or starburst patterns in photos.

A pyrotechnic flare is a bright, short-duration signal or illumination device used for distress signaling, battlefield signaling, or aircraft landing, typically burning with colored flames. Flare devices may pose burns or eye injuries and require careful handling.

In medicine, a flare refers to a temporary worsening of symptoms or inflammation in a chronic condition, often triggered by infection, stress, or medication changes. Management focuses on symptom relief and adjusting treatment.

In fashion, flare describes a trouser or skirt cut that widens from the knee downward, creating a bell-shaped silhouette.