RADIN4 VARIABLES

  
   
                                                                       
AIRMAS:  A measure of the pathway length that solar radiation travels      
         through the atmosphere.                                         

AVERAD:  Total visible radiation measured with a horizontal sensor above  
         the canopy. Identical with RADSOL and RADTOP(2,IHR) in MAIN.     

EVAL:    Potential diffuse NIR radiation at the earth's surface.         
                                                                        
FB1:     Ratio of potential direct beam radiation to potential beam and
         diffuse radiation on the horizontal for VIS.

FB2:     Ratio of potential direct beam radiation to potential beam and
         diffuse radiation on the horizontal for NIR.

FBEAM1(1,IHR):  Ratio of the actual direct beam radiation over actual
                beam and diffuse radiation for visible wavelengths.

FBEAM1(2,IHR):  Ratio of the actual direct beam radiation over actual
                beam and diffuse radiation for NIR wavelengths.

IPOT:    Index indicating method of calculation for RATIO(IHR),=1: fixed  
         input of RATION and RATIOD,=0: calc in RADIN4 for every hour.    

POTBM1:  Potential direct beam visible radiation at the earth's surface.
    
POTBM2:  Potential direct beam NIR radiation at the earth's surface.     
                                                                        
POTDIF:  Potential diffuse visible radiation at the earth's surface. 

POTNIR:  Potential beam and diffuse NIR radiation at the earth's surface.

POTVIS:  Potential beam and diffuse visible radiation at the earth's 
         surface.

RADABV(1,IHR):   Visible radiation flux density above the canopy
                 including direct beam and diffuse.

RADABV(2,IHR):   NIR radiation flux density above the canopy
                 including direct beam and diffuse.

RATIO:   Ratio of actual total solar radiation and potential total
         solar radiation including VIS and NIR, direct and diffuse.

RATIOD:  Input variable for ratio during the day.

RATION:  Input variable for ratio at night.

WATABS:  Solar radiation in the NIR absorbed by atmospheric water.