Sun occlusion, what does it do?

Sun occlusion off:
View attachment 1266
Sun occlusion on:
View attachment 1267

What does it do exactly? I can see no difference in the sun itself nor anywhere else.

 

I think, you need clouds, to test it.

 

I think sun occlusion is the effect of changing brightness of a scene while sun rays go through clouds.
Nice effect anyway

 

OIC, gotcha.