A closer analysis of the coincidence of auroree with hours of high and low magnetic 

 character is not without interest. With this object, Table 17 has been formed for 

 three classes of auroroe above normal brightness, below normal brightness and " no 



TABLE 17. Relation between Auroral Intensity and Magnetic Character at Cape Evans, 



1911. 



Number of Observations ivtth Magnetic Character 2-0 or J -5 and Number of Observations 

 with Magnetic Character (in brackets), at exact hours only. 



aurora " showing the coincidence with hours of magnetic character 1-5 or 2 and of 

 magnetic character 0, for different hours of the day, the numbers referring to the 

 latter being shown in brackets. 



As might be expected, the sums of the two numbers in each class, corresponding 

 to magnetically disturbed and quiet conditions, show a diurnal variation similar to 

 that shown in Table 8, which is derived from all hours. 



It is in the afternoon that aurorse are most likely to correspond with magnetically 

 disturbed hours and in the morning that auroraB are most likely to be seen during 

 magnetically quiet hours. 



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