677 
Figure 2 .Reflectance image at 450 nm over stratiform cloud,Darker shades correspond to lower 
reflectances. 
Figure 3 : Polarized reflectance image at 450 nm over stratiform cloud. Darker area correspond to lower 
reflectances. 
The flight direction here was nearly parallel to the sun incident plane, with the antispecular 
direction (i.e. scattering angle 180°, or zero phase angle) near the top of the picture, and this 
highly polarized feature corresponds to viewing directions (0 v ,<t>v) such that the scattering 
angle 0 is near from 140° (i.e. cos © = cos0 s cos8 v + sin0 s sin0 v cos4> v ). This rainbow signature 
was a permanent characteristic of these low, very probably liquid water clouds. 
In other viewing directions, the polarized reflectance remained rather low. 
Scattering angle (degreel 
Figure 4 Polarized reflectances versus scattering angle at 40U and 850 nm.