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Flashcards in CH12 Deck (13):
1

Solar Energy/Solar Radiation

The amount of solar energy striking the outer edge of the atmosphere is determined by the sun’s intensity and duration

2

Intensity

depends on the angle at which the sun’s rays strike the surface

3

Duration

refers to the length of daylight

4

Remember

These vary from place to place, every place on Earth experiences variations through out the year

5

Variations in Solar Energy Throughout the Year

Variations in solar radiation throughout the year occur due to the following Earth-­‐Sun Relationships
-Earth rotates on a axis
-It also revolves around the sun

6

Axis of earth

Earth is inclines 23.5 degrees from the perps circular to the plane of it's orbit

7

Variations in Solar Energy Throughout the Year

-Throughout the year, the axis of Earth points to the same place in the sky
-This causes the overhead (vertical, or 90˚) noon Sun to cross the equator (0˚ latitude) twice as is migrates from the Tropic of Cancer to the Tropic of Capricorn

8

Variations in Solar Energy Throughout the Year

the position of the overhead noon Sun gradually shifts between hemispheres, the intensity and duration of solar radiation in a particular location continually changes throughout the year

9

Summer solstice

June 21 or 22
Earth is positioned so that the northern axis is tilted 23.5 degrees towards the sun.

The vertical rays of the Sun strike at a latitude known as THE TROPIC OF CANCER

10

Winter Solstice

December 21 or 22, Earth is in the opposite position so that the southern axis is tilted 23.5˚ toward the sun. T

he vertical rays of the Sun strike at a latitude known as the TROPIC OF CANCER

11

Autumnal Equinox/Fall Equinox

September 22 or 23

12

Spring Equinox

March 21 or 22

13

Variations in Solar Energy Throughout of the Year

Equator (0 latitude)

Tropic of Cancer (23.5 N)

Tropic of Capricorn (23.5 S)