SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. J^ 



SUNSPOT PBRIOD - PRBSSDRE 



80 160 140 120 100 80 60 40 20 O 20 40 60 80 100 120 140 160 130 



ISO 160 140 



00 80 60 40 20 20 40 60 80 100 120 140 160 180 



Fig. 32. — Shaded areas show where the pressure is higher at sun-spot maxi- 

 mum than at sun-spot minimum. Broken lines show where the pressure is 

 lower at_ sun-spot maximum than at sun-spot minimum. The numbers at ends 

 of lines indicate millibars. 



