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Figure 9.9. Calculated peak solar intensity in summer at 65 N at three northern latitudes over
the past 400,000 years.
Figure 9.10. Relative peak solar intensity in summer at 65 N over 400,000 years.
very similar, although yearly peak irradiance decreases as latitude increases. The
magnitude of variability of solar irradiance over 800,000 years about the mean is
about 5% at 60 N and increases to about 7% at 75 N.
The pattern of variability of peak solar intensity in Figure 9.10 may be
regarded as a rapidly varying ( 22,000-year period) contribution due to precession
of the equinoxes, with an envelope whose amplitude depends on the more slowly
 
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