prevent environment radiation

Hello,

I want to do CFD simulation including radiation.

After create my solid model, see the solar and environment radiation vectors. Top surface is my ground surface, actually its soil block. Why environmental radiation vectors around the soil block even bottom side. To me its look like soil block float in the air. How can I eliminate this problem or is it possible to ignore this issue?

Thank You,

Janitha.

SolidworksSimulation