Luckyer and Lochjer. 



Buy. Soc. Proc, vol. 71, Plate 6. 



SUNSPOTS. 



I 



MEAN DAILY 

 AREA. 



25- 



PROMINENCES 



%FRE(JUENCIES.|3 

 NORTH LATS. 

 (TACCHINI) *. 



20-i 



MEAN 

 HEL10GRAPHIC 

 LATITUDE 0F |Q 



SUNSPOTS 



NORTH OF 

 EQUATOR. 



80 



LATITUDE 



OF 60 

 PROMINENCES 

 N.HEM? 40 



(RICCO 



AND +20 

 MASCARI) 



0' 



LATITUDE 



OF 



PROMINENCES^, 



N. HEM? 

 (TACCHINI : 



Plate 6.— Curves showing the Relation between the Positions of the Centres of Action of Solar Prominences (A and B) and Spots (C), Percentage Frequency 

 of Prominences (D), and Mean Daily Areas of Spots (E), for the Northern Hemisphere of the Sun. 

 Note.— The continuous and broken vertical lines represent the epochs of sunspot maxima and minima as determined from the mean daily areas of the whole 



solar disk. 



