Bigelow — Determination of the " Solar Constants 279 



S [K, — K ] radiation energy _ _ 



2 [ — ! ° ] free heat per vol. change 



2 [ Pj — P n ] pressure difference 



2 [ Jz—CjT*! — c T a o] selective radiation 



1-4528 

 0-0000 



1-4602 



1-4603 



1-4672 1-4802 



0'0087 



1-4404 

 1-4610 



+ 0-0352 



1-4085 

 1-4395 



General mean of the thermodynamic data 4-0979 



General mean of the black body radiation data J 3-9476 



General mean of the radiation and pressure data 1-4516 



General mean of the selective radiation data J a 1*4536 



It will be noted that the thermodynamic and the black body 

 radiation agree upon 4*00 gr.cal./cm 2 . min. as the amount 

 required to raise a solid atmosphere at 0°A, through the liquid 

 air state, into the conditions P . p . R . T . now existing from 

 the surface to the top. Since this action is continuous 4/00 cal. 

 is the true value of the " solar constant " and not 2'00 cal. as 

 given by the pyrheliometer. The thermodynamic and selective 

 radiation data agree that there is an absorption of 1*45 calories 

 from the top down to the surface, which is in a condition to 

 continuously emit the same amount of radiant energy. 



We reproduce more specifically the values of J on several 

 levels, that is the total amount from the top to the given level, 

 for Sept. 13, 1911, in order to develop the corresponding 

 curve of absorbed radiation. 



The Equation for Temperature Equilibrium: 

 (7) Effective radiation inward = I = A — J 3 — B. I = B. 



z 



J a 



i(4'00-J a )=I = B 



A 



90000 



o-oooo 



2-000 



4-000 







2-000 



a 







2-000 



u 







2-000 - 



u 







1-999 



u 



46000 



0-004 



1-998 



u 



36000 



0-034 



1-983 



(6 



26000 



0-100 



1-950 



it 



16000 



0-258 



1-871 



u 



6000 



0-806 



1-597 



u 



000 



1-461 



1-270 



4-000 



A = Solar constant 4-00 

 I ^Effective radiation from 2-00 to 1-27 

 B = Return radiation from 1*27 to 2*00 

 J a = Absorbed and emitting radiation from 1 -46 to 0. 



