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Solar UV and Ozone Layer

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Solar UV and Ozone Layer

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The column of absorbing gas in the path of incoming radiation includes atomic and molecular nitrogen and oxygen and their products. These gases block all short wave ultraviolet radiation. Molecular oxygen in the stratosphere (10 to 48 km) absorbs short wave (up to 242.4 nm from the ground state and with very strong bands from 50-100 nm, and 140-175 nm) ultraviolet and photodissociates. The atomic oxygen produced leads to the production of ozone. Ozone strongly absorbs longer wave ultraviolet in the Hartley and Huggins bands from 200 - 360 nm (Fig. 1), and has additional weak absorption bands in the visible (Chappius bands from 450 - 750 nm) and infrared.

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