A Solar Flux Unit (SFU) is a measure of solar radio flux, specifically at a frequency of 2800 MHz (or 2.8 GHz). It is commonly used in solar and astrophysical research to quantify the intensity of solar radiation, particularly from the Sun's active regions such as sunspots and solar flares. 1 SFU is defined as a flux density of \(10^{-22}\) watts per square meter per hertz (W/m²/Hz).
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