Workshop Presentations - The Effects of Solar Variability on Earth's Climate - page 11

FIGURE 2.2 Image of the Sun's upper photosphere in the 170 nm continuum showing the magnetic structures
responsible variation in for TSI and in 130-240 nm UV irradiance. SOURCE: Courtesy of P. Foukal, Heliophysics,
Inc.

Rotational brightening
(active region faculae)

4

3

0.1%

11- yr
brightening
(enhanced
network)

2

1

0

0 2000 4000 6000 8000 10000 12000

-1

-2

zero level (set by TSI contribution of quiet network )

Rotational dimming
(sunspots)

-3

-4

Time (days since 11/17/78)

FIGURE 2.3 Variation in TSI measured radiometrically (Physikalisch-Meteorologisches Observatorium Davos
composite) between 1978 and the present, identifying the magnetic structures responsible for variation in TSI and
the 130-240 nm UV irradiance. SOURCE: Courtesy of P. Foukal, Heliophysics, Inc.