Ci compared with Cc

(Section 2.3.1.6.1)

Cirrus is distinguished from Cirrocumulus by:

• Mainly fibrous or silky appearance
• Absence of small cloud elements in the form of grains, ripples, etc
• Absence of a corona or irisation 
• Possible shading in thick Cirrus and no shading in Cirrocumulus
• Absence of virga