Nocturnal radiation - kettle

Japanese: 夜間放射 - やかんほうしゃ
Nocturnal radiation - kettle
It is the difference between the ground radiation emitted by the earth's surface into the sky according to its temperature, minus the back radiation from the atmosphere to the ground. The latter is about 1/2 to 1/4 of the former radiation. The maximum energy of ground radiation is around a wavelength of 10 μm. It is measured precisely at night when there is no influence of solar radiation, and is useful for predicting frost, etc. →Atmospheric radiation

Source : Heibonsha Encyclopedia About MyPedia Information

Japanese:
地表面がその温度に応じて上空に放射している地面放射から，大気から地面への逆放射を引いた差。後者は前者の放射量の1/2〜1/4程度。地面放射のエネルギーの最大は波長10μm付近にある。日射の影響のない夜間に精密に測定され，霜の予想などに意味がある。→大気放射

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