Direct polar radiation increases as....

[QuarkDecay]

Does direct radiation increase as the zenith increases? I know the diffuse radiation increases as zenith does, but is it the same for direct
Also is it right to say that when diffuse radiation increase, the direct should decrease and vice versa?

edit: My book says diffuse increases as we move towards the Dusk. But does it also increase as we move towards Dawn?

 

[davenn]

Summary: Direct and Diffuse radiations with zenith angle

Does direct radiation increase as the zenith increases?

Radiation from where ?

 

[QuarkDecay]

Radiation from where ?

from the sun. Solar

 

[sophiecentaur]

Radiation from where ?

And on what?

 

[davenn]

And on what?

I dunno, ask the OP

 

[sophiecentaur]

Ha. I was adding to your question. Not asking you. I should have added some appropriate punctuation, perhaps.
The whole question needs an answer or perhaps a reference.

 

[davenn]

Ha. I was adding to your question. Not asking you.

yeah, I realized that but I doubt that the OP did LOL D

 

[geoelectronics]

Summary: Direct and Diffuse radiations with zenith angle

Does direct radiation increase as the zenith increases? I know the diffuse radiation increases as zenith does, but is it the same for direct
Also is it right to say that when diffuse radiation increase, the direct should decrease and vice versa?

edit: My book says diffuse increases as we move towards the Dusk. But does it also increase as we move towards Dawn?

Sounds like you are looking for information on the Beer-Lambert law, more specifically the Lambert's cosine law:

groups.csail.mit.edu/.../6.837/F01/Lecture15/lecture15.pdf