Definition of facula in English:


Line breaks: fac¦ula
Pronunciation: /ˈfakjʊlə

noun (plural faculae /-liː/)

  • 1A bright region on the surface of the sun, linked to the subsequent appearance of sunspots in the same area.
    More example sentences
    • Associated with sunspots are brighter areas called faculae.
    • If the faculae loom above the surface, they could radiate light efficiently, thereby boosting the sun's overall brightness, especially during the solar maximum.
    • Although not easily discerned in telescopic views of the Sun, these features are brilliant enough that the overall effect of the combined spots and faculae is to boost irradiance levels.
  • 1.1A bright spot on the surface of a planet.



More example sentences
  • During sunspot maximum, both increased facular activity and increases in the magnetic network of bright regions associated with supergranulation are required to explain the increased luminosity.
  • The competing effects of bright "facular" regions and dark sunspots, both of which are more numerous at solar maximum, seem to explain this variation.


early 18th century: from Latin, diminutive of fax, fac- 'torch'.

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