THE NORWEGIAN 



AURORA POLARIS EXPEDITION 



1902-1903 



VOLUME I 



ON THE CAUSE OF MAGNETIC STORMS AND 

 THE ORIGIN OF TERRESTRIAL MAGNETISM 



BY 

 KR. BIRKELAND 



FIRST SECTION 



LEIPZIG 



JOHANN AMBROSIUS EARTH 



CHRISTIANIA 

 H. ASCHEHOUG & CO. 

 LONDON, NEW YORK 



LONGMANS, GREEN & CO. 



PARIS 

 C. KLINCKSIECK 



Of 



