The solar constant includes all types of solar radiation, not just visible light.
From the en.wikipedia.org
Engineers talk about the power of the Sun in units called the solar constant.
From the sciencedaily.com
So the change would be 1.6%. The equilibrium radiative output is simply one quarter of the solar constant.
From the newscientist.com
The solar constant refers to the amount of incoming solar radiation measured on the outer surface of Earth's atmosphere.
From the sciencedaily.com
Since sunspots are darker than the surrounding photosphere it might be expected that more sunspots would lead to less solar radiation and a decreased solar constant.
From the en.wikipedia.org
The term solar constant is the amount of incoming solar electromagnetic radiation per unit area, measured on the outer surface of Earth's atmosphere, in a plane perpendicular to the rays.
From the en.wikipedia.org
The researchers set solar radiation at a constant level in the climate models.
From the sciencedaily.com
The amount of solar wind is not constant due to changes in solar activity.
From the en.wikipedia.org
The solar wind is a constant stream of electrically charged particles from the Sun.