The solar flux unit (sfu) is a non-SI unit of spectral flux density often used in solar radio observations, such as the F10.7 solar activity index. It is equivalent to 10−22 watts per square metre per hertz (SI), 10−19 ergs per second per square centimetre per hertz (CGS), and 104 Jansky.
References
External links F10.7 cm Radio Emissions | NOAA / NWS Space Weather Prediction Center