pal: 
Figure 4 : Temporal variation of brightness temperatures at 4.9, 21, 36 GHz 
  
  
  
  
TIME CH) 
1x0 MAY 24 - 2 
  
vertical polarization and of backscatter coefficient V is due to 
formation of a (refrozen) crust and melting. 
  
  
       
  
  
  
T Tr TT TTT] T rr rn 
L V ----------2-2-z = 
i V — 
256 Lr - 
a H 
0 ----10 M + 
S a ess TOM S 
200 . H 7] 
| Lg La Tri] l nl roe 
1 Griz 10 100 
FREQUENCY 
Figure 5 : Brightness temperature spectra at two different times of a day 
(June 18, 1980) due to the setting of a layer of freshly fallen 
hunid snow. Incidence angle 50°. Dashed lines for 10 a.m., full 
lines for 3 p.m., vertical (v) and horizontal (h) polarization. 
806