﻿*l22 Mr. L. Vejnird on ihe Properties of. 



various polar stations during the polar year lb'8--83. The 

 numbers in the second to eleventh columns give for hour- 

 intervals the total number of aurorse of the form considered 

 which have been observed from the beginning of October 1882 

 to the end of March 1883. The form is given cne mark each 

 time it is observed, provided the time-interval between suc- 

 cessive observations is greater than 0"2 hour. Thus the type 

 counted is never given more than one mark in an interval 

 of 0'2 hour, even when the same type has been recorded 

 several times during that same interval. 



In spite of the disturbing influence of daylight, the curves 

 for the distribution during the night-lime show the existence of 

 one well-mat ked evening maximum, and also for the corona 

 and drapery forms a well-marked minimum just after mid- 

 night. In most cases w e also find a morning maximum, 

 which, however, is not very well marked ; and although its 

 existence can hardly be doubted, the determination of its 

 time of occurrence is rendered difficult, partly from the 

 small frequency of aurorse at this part of the night, partly 

 from the fact that it occurs so late in the morning that the 

 daylight may have a disturbing influence on its position. 



Jn Table III. is given the position of the various stations 

 and the occurrence of the evening maxima. 



Table III. 











Time 



of evening 







Station. 













max. 





Cm. 



Latitude. 



Longitude. l'orm. 



r. 



Each 



form. 



Mean. 



«. 















P.M. 







Eof&t'kop 



69°57'N. 



23°15'E. £° r , 0,1 V. 



Kadiant tonus ... 



20 

 2*9 



9.0 i 



9.5 



>.M. 



) 9.25 

 J 



14°-5 



5°-5 



Cap Tliordsen. 



7S C 28'1S\ 



15°42'E. 



Corona 



Draperies 



115 



3-3 



7.5 



8.4 



i> 



] 8.0 



14° -5 



4°-l 



Godlhaab 



64 C 11'N. 



C6° 36' N. 



51°43'W. 

 67°15'W. 



droua 



25 

 34 



OMiO 

 032 



It). 3 

 9.3 



10.3 

 10.9 



» 



J9.S 



llO.o 



22° 

 19°-1 



20° -9 

 24° 5 





Corona 



Kingua Fjord. 



Rays & Lraperies 



Fort Rae 



62°39'K. 



115° 44' TV. 



Curtain-shaped .. 

 In Zenith 



1-4 

 0-61 



11.5 

 125 a 



.M. 



]l2.0 



18°-9 



22° -2 



The quantity r is, the ratio between the number of aurorse 

 observed before to those observed after midnight. 



The curves show that aurorre are far from being equally 

 distributed on both sides of midnight. This asymmetry 



