From Glossary of Meteorology
A bright, transient event within the sun's chromosphere and corona.
Flares produce enhanced emission at radio frequencies and in the ultraviolet and x-ray spectral regions as well. They may also produce increased particle emission, often with ions of cosmic ray energies. Flares usually appear within minutes and fade within an hour. They are localized to small areas (typically <10-3 of the solar disk) and usually occur within solar active regions.
Copyright 2022 American Meteorological Society (AMS). For permission to reuse any portion of this work, please contact email@example.com. Any use of material in this work that is determined to be “fair use” under Section 107 of the U.S. Copyright Act (17 U.S. Code § 107) or that satisfies the conditions specified in Section 108 of the U.S.Copyright Act (17 USC § 108) does not require AMS’s permission. Republication, systematic reproduction, posting in electronic form, such as on a website or in a searchable database, or other uses of this material, except as exempted by the above statement, require written permission or a license from AMS. Additional details are provided in the AMS Copyright Policy statement.