Earth’s atmosphere is transparent to infrared radiation in the wavelength band which is called atmospheric window :
8 – 13 μ
The Earth’s surface, at about 288 K, emits thermal radiation peaking near 10 μm (Wien’s law: \(\lambda_{max} = 2898/288 \approx 10~\mu m\)).
Most of this long-wave radiation is absorbed by water vapour (strong band near 6.3 μm and the rotational band beyond about 20 μm) and by carbon dioxide (strong band centred near 15 μm).
Between roughly 8 and 13 μm absorption by these gases is weak (apart from the ozone band at 9.6 μm), so terrestrial radiation escapes to space; this band is the atmospheric window used by thermal infrared satellite sensors.
The 14–17 μm band is the CO2 absorption band, 5–7 μm lies on the water vapour band, and a 7–20 μm range would include both absorbing regions, so none of them is transparent.
Therefore the atmospheric window is the 8–13 μm band.
Hence, 8 – 13 μ.
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.................... is a client server application that identifies each host on the internet with a unique user-friendly name.
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