plage
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Plage (bright central feature) taken in the CaII
K band on Jan. 6, 1980 at Sacramento Peak NSO
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A bright spot in the solar chromosphere,
usually found in or near an active region
such as a sunspot; the name is French (with
a short "a") and means "beach." Plage, not to be confused with the photospheric
faculae, are normally only visible in the
monochromatic light of spectral lines, such as H-alpha
or Ca II. They can last for several days and mark areas of nearly vertical
emerging or reconnecting magnetic field lines. Plages were formerly known
as flocculi. A plage corridor is a space
in a plage lacking plage intensity and coinciding with a polarity inversion.
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• SOLAR
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