What is Flare star?
A '''flare star''' is a [[variable star]] that becomes very much brighter unpredictably for a few minutes at a time. Flares happen on flare stars in a similar way to [[solar flare]]s. They are magnetic disturbances in the atmosphere of [[star]]s. The brightness increases across the [[Electromagnetic spectrum|spectrum]], from [[X ray]]s to [[radio wave]]s. The first known flare stars were discovered in 1924, they were [[V1396 Cygni]] and [[AT Microscopii]]. Still the best-known flare star is [[UV Ceti]], that star was discovered in 1948. Today similar flare stars are classified as UV Ceti type [[variable star]]s in variable star catalogs. Flares can happen once every few days or, as in the case of [[Barnard's Star]], much less frequently. [[Proxima Centauri]], the nearest star to the [[Solar System]], is also a flare star. Most flare stars are dim [[red dwarf]]s, although less massive (lighter) [[brown dwarf]]s might also be able to flare.<ref>{{Cite web|url=https://science.nasa.gov/science-news/science-at-nasa/2000/ast12jul_1m|title=Brown Dwarf Solar Flare {{!}} Science Mission Directorate|website=science.nasa.gov|access-date=2019-04-25|archive-date=2019-04-25|archive-url=https://web.archive.org/web/20190425040556/https://science.nasa.gov/science-news/science-at-nasa/2000/ast12jul_1m|url-status=dead}}</ref> The more massive (heavier) [[RS Canum Venaticorum variable]]s (RS CVn) are also known to flare, but scientists understand that a companion star in a binary system causes these flares. This companion star disturbs the [[magnetic field]]. Nine stars similar to the [[Sun]] have also been seen to flare.<ref>{{cite journal|bibcode=2000ApJ...529.1026S|date=2000 |publisher=Astrophysical Journal|last1=Schaefer|first1=Bradley|title=Superflares on ordinary solar-type stars|doi=10.1086/308325|journal=The Astrophysical Journal|volume=529|issue=2|pages=1026|last2=King|first2=Jeremy R.|last3= & Deliyannis|first3=Constantine P.|arxiv = astro-ph/9909188 |s2cid=10586370 }}</ref> There is a suggestion that this happens for