Sunspot Area
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Sunspot area as a function of time since 25 April 1988.
Sunspot area is the total area of all sunspots on the solar disk, computed from the red (672.3 nm) images, in millionths of the solar hemisphere. Click here for full-size version. |
Sunspot Deficit
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Sunspot deficit as a function of time since 25 April 1988.
Sunspot deficit is the change, in millionths, of the total solar irradiance (TSI), formerly known as the "solar constant", due to sunspots. This value is computed from the measured contrast of all sunspots seen in the red (672.3 nm) image. Click here for full-size version. |
Facular Area
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Facular area as a function of time since 25 April 1988.
Facular area is the total area of all faculae on the K line image, in millionths of the solar hemisphere. Click here for full-size version. |
Facular Excess
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Facular excess as a function of time since 25 April 1988.
Facular excess is the change, in millionths, of the total solar irradiance (TSI) due to faculae. This value is computed from a model and the sizes and locations of the bright areas seen in the K line image. Click here for full-size version. |
K Line Excess
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K line excess (also known as Photometric Facular Index or PFIFX) as a function of time since 25 April 1988.
K line excess is the change, in millionths, of the emission from the Sun in the Ca II K line image due to the presence of faculae. Click here for full-size version. |
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Last updated: March 6, 2005