Duration and Intensity of Solar Radiation:

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Duration and Intensity of Solar Radiation

• How do they affect climate?

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Intensity
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Tropic of Cancer, 23.5N
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Tropic of Cancer, 23.5N
Tropic of Capricorn, 23.5S
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Duration
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Sunlight on this day is directly over Tropic of
Cancer. The length of time the Tropic of Cancer
is exposed to daylight on this date is greater
than the length of time it is in darkness. The
yellow line (day) is longer than the red line
(night). This means more solar radiation is
received and temperatures are higher. This is the
duration of solar radiation received.
Sunlight
June 21/22 - Summer Solstice in Northern
Hemisphere
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The opposite is true at the Tropic of
Capricorn. The length of time the Tropic of
Capricorn spends in the daylight is shorter than
in darkness. The red line (night) is longer than
the yellow line (day). Therefore, less solar
energy is received here, and temperatures are
cooler. It is winter in the Southern Hemisphere.
Sunlight
June 21/22 - Winter Solstice in Southern
Hemisphere
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Notice that above the Arctic Circle, 66.5oN, the
sunlight is constant. The sun never sets. It is
called the Land of the Midnight Sun.
South of the Antarctic Circle the opposite is
true 24 hours of no (direct) sunlight.