radio window

American  

noun

Astronomy.

1. the range of wavelengths at which the earth's atmosphere is transparent to radio waves.

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radio window British  

noun

1. a gap in ionospheric reflection that allows radio waves, with frequencies in the range 10 000 to 40 000 megahertz, to pass from or into space

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Example Sentences

Still, the radio window has already brought the universe to life in numberless unexpected ways.

From Time Magazine Archive

The radio window was accidentally opened for the first time in 1932 by Karl Jansky. a Bell Telephone physicist who was studying the crackling static that can be so annoying in radio communications.

From Time Magazine Archive

Reber had opened wide the radio window on the sky.

From Time Magazine Archive

The trailers, fitted with kitchen, shower, radio, window screens, flush toilet, are as comfortable as Miami bungalows.

From Time Magazine Archive

British astronomers, often frustrated by the persistent clouds over their murky island, have taken advantage of this "radio window" and are busily developing the brand-new science of radio astronomy.

From Time Magazine Archive