56 A WORLD ATLAS OF ATMOSPHERIC RADIO REFRACTIVITY 



180 150 120 90 



180 150 



90 60 



30 



30 60 90 120 150 180 



Figure B-8. Monthly mean AN: July. 



50 180 



80 



180 150 120 90 60 30 30 60 90 120 150 180 



Figure B-9. Monthly mean AN: August. 



