sudden intense brightening of a small part of the Sun's chromosphere in the vicinity of a plage or facula and often near a sunspot group. The flare develops in a few minutes and may last several hours. Most of the energy consists of ultraviolet radiation; intense X rays are also emitted, along with cosmic rays and less energetic particles. The particles travel much slower than the light of the flare and reach the vicinity of Earth a day or two later; they pose a potential radiation hazard to human beings in space. Flare-emitted radiation and particles, by their interaction with Earth's magnetic field and ionosphere, disrupt radio communications and cause auroras.
SOLAR FLARE
Meaning of SOLAR FLARE in English
Britannica English vocabulary. Английский словарь Британика. 2012