In 1973 IAU General Assembly resolved that the name ‘Jansky,’ abbreviated ‘Jy’ be adopted as the unit of flux density in radio astronomy and that this unit, equal to 10-26 Wm-2Hz-1, be incorporated into the international system of physical units. Although originally intended to define only the unit of radio flux density, the Jansky has become the de facto unit for measurements throughout the electromagnetic spectrum
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