B band
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A broad Fraunhofer line in the Sun's spectrum at around 687 nm, due to absorption by molecular oxygen in the Earth's atmosphere. The B band is actually a group of close, regularly spaced lines spanning about 2 nm, unresolved at low resolution.
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B band
Not to be confused with UBV photometric system.
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The B band is the range of radio frequencies from 250 MHz to 500 MHz in the electromagnetic spectrum. This is equal to wave lengths between 1.2 m and 0.6 m. The B band is in the VHF/UHF range of the radio spectrum.
The B band is identical to the P band of the older IEEE classification system.
See also
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Oxford Dictionary of Astronomy
A Dictionary of Astronomy. © 1997
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