还记得孙燕姿那首红遍大江南北的《绿光》吗?“翻越过前面山顶、层层白云,绿光在哪里?”——不知道有多少人跟小编一样,以为歌里的“绿光”只是对幸福的比喻。而其实在现实中,“绿光”是真实存在的呢!来看看它的解释吧:
Green flashes and green rays are optical phenomena that occur shortly after sunset or before sunrise, when a green spot is visible, usually for no more than a second or two, above the sun, or a green ray shoots up from the sunset point。
绿光的形成过程
The reason for a green flash lies in refraction of light (as in a prism) in the atmosphere: light moves more slowly in the lower, denser air than in the thinner air above, so sunlight rays follow paths that curve slightly, in the same direction as the curvature of the Earth. Higher frequency light (green/blue) curves more than lower frequency light (red/orange), so green/blue rays from the upper limb of the setting sun remain visible after the red rays are obstructed by the curvature of the earth。 |
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