The solar flux unit (sfu) is a convenient measure of spectral flux density often used in solar radio observations, such as the F10.7 solar activity index: :1 sfu = 10⁴ Jy = 10⁻²² W⋅m⁻²⋅Hz⁻¹ = 10⁻¹⁹ erg⋅s⁻¹⋅cm⁻²⋅Hz⁻¹. See

jansky The jansky (symbol Jy, plural ''janskys'') is a non- SI unit of spectral flux density, or spectral irradiance, used especially in radio astronomy. It is equivalent to 10−26 watts per square metre per hertz. The ''spectral flux density'' ...

for further information about related units; one Jy = 10^-4 sfu = 10⁻²⁶ W⋅m⁻²⋅Hz⁻¹ = 10⁻²³ erg⋅s⁻¹⋅cm⁻²⋅Hz⁻¹.

References

External links

F10.7 cm Radio Emissions , NOAA / NWS Space Weather Prediction Center
Units of measurement in astronomy Radiometry {{Astronomy-stub