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MULTI-BAN 
ABSTRACT: 
A weather resistan 
measurements of a 
the Geostationary 1 
time dependence o 
the instruments, 
application to atm< 
retrievals. We es 
network wide acci 
0.1 to 3. |im. 
KEY WORDS: 
1 - INTRODUC 
Ground h 
Voltz (1959) intrcx 
accurately and qu 
extinction of direct 
V = V D ex 
where: 
Other stra 
measures spectral 
thickness is comp