atmospheric window

A range of electromagnetic wavelengths to which Earth's atmosphere is largely or partially transparent. All spectral regions are affected to some extent by absorption in the atmosphere but there are two nearly transparent ranges, the optical window and the radio window, and several narrow, partial i...
Found on http://www.daviddarling.info/encyclopedia/A/atmospheric_window.html

Atmospheric window

refers to those parts of the electromagnetic spectrum that are, with the Earth's atmosphere in its natural state, not absorbed at all.
Found on http://www.translationdirectory.com/glossaries/glossary304.php

atmospheric window

The spectral region between 8.5 and 11.0 microns where the atmosphere is essentially transparent to longwave radiation.
Found on http://cdiac.ornl.gov/glossary.html
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