The solar flux unit 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. Wikipedia