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• In solar-terrestrial terms, rank of a flare based on its X-ray energy output. Flares are classified by the order of magnitude of the peak burst intensity (I) measured at the earth in the 1 to 8 angstrom band as follows:

  Class	Intensity (in Watts/m2)
  B	I < 10-6
  C	10-6 <= I < 10-5
  M	10-5 <= I < 10-4
  X	I >= 10-4

  NOAA National Weather Service - Cite This Source - This Definition
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  Cite Definition for X-Ray Flare Class

  American Psychological Association (APA)

  X-Ray Flare Class. (n.d.). National Weather Service Glossary. Retrieved June 10, 2023, from website: http://www.expertglossary.com/definition/x-ray-flare-class.

  Chicago Manual of Style (CMS)

  X-Ray Flare Class. www.weather.gov. National Weather Service Glossary. NOAA National Weather Service. http://www.expertglossary.com/definition/x-ray-flare-class (accessed: June 10, 2023).

  Modern Language Association (MLA)

  "X-Ray Flare Class." National Weather Service Glossary. NOAA National Weather Service. 10 June. 2023 http://www.expertglossary.com/definition/x-ray-flare-class.

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