Radiance at earth orbit

  • Thread starter fredrick08
  • Start date
  • #1
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Homework Statement


given that T(sun)=5771.4, S(Earth)=1370, D(Earth)=1.5x10^8km, R(sun)=7x10^5km

calculate the radiance of solar radiation at earth orbit


Homework Equations


Irradiance=Radiance/Solid Angle
Solid Angle=Area/Distance^2
I=sigma*T^4


The Attempt at a Solution


Radiance=1370/solid angle... but how do i find the solid angle... i get answers thats are very large... but im as confused as hell what to use
 

Answers and Replies

  • #2
376
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is it 1370/(pi*R(Sun)^2/D(earth)^2)=2x10^7 Wm^-2st-1?
 

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