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In radio astronomy, the flux unit or jansky (symbol Jy) is a non-SI unit of spectral electromagnetic flux density equivalent to 10 watts per square metre per hertz. The flux density or monochromatic flux,, of a source is the integral of the spectral radiance,, over the source solid angle: The unit is named after pioneering US radio astronomer Karl Guthe Jansky, and is defined as: The flux density in Jy can be converted to a magnitude basis, for suitable assumptions about the spectrum. More information...
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