What is the 'Belt of Venus' in relation to the general atmospheric afterglow?

Answer

The pinkish or reddish glow seen above the Earth's shadow (twilight wedge).

The Belt of Venus is the pinkish or reddish glow visible above the twilight wedge, which itself marks the Earth's shadow cast into the atmosphere opposite the sunset.

What is the 'Belt of Venus' in relation to the general atmospheric afterglow?
lightastronomyskysunset