Solar flux unit

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]

1 sfu = 10⁴ Jy = 10⁻²² W⋅m⁻²⋅Hz⁻¹ = 10⁻¹⁹ erg⋅s⁻¹⋅cm⁻²⋅Hz⁻¹.

solar flux unit
Unit system	non-SI metric unit
Unit of	spectral flux density
Symbol	sfu
Conversions
1 sfu in ...	... is equal to ...
SI units	10−22 W⋅m−2⋅Hz−1
CGS units	10−19 erg⋅s−1⋅cm−2⋅Hz−1

See jansky for further information about related units; one Jy = 10⁴ = 10⁻²⁶ W⋅m⁻²⋅Hz⁻¹ = 10⁻²³ erg⋅s⁻¹⋅cm⁻²⋅Hz⁻¹.