portion of the year, there was sufficient light at noon to obsrmv any but the brightest 

 aurorse seen at Cape Evans. 



TABLE 5. Distribution of Aurora at different times of clay, Cape Evans, 1911. 



The Table shows, in the first place, that at almost every hour of the day, aurora 

 is most likely to occur in the North-East or East, or in one of the adjoining sectors. 

 The " rare sectors " are equally clearly shown for all hours of the day. In the 

 second place, there is a fairly definite tendency towards a maximum of frequency, 

 in almost all sectors, between 4 and 8 hours (time of 180th meridian). An exception 

 is, however, afforded for the quadrant S. to S.W., the maximum appearing at 23 hours 

 in this case. 



In the Table, the sum of all the numbers for each sector is formed in the penultimate 

 column headed '' Number of occurrences in all sectors," while the last column shows 

 the " Number of observations " of aurora at each hour. The figures in the penultimate 

 column are, therefore, those in the last column weighted by a number more or less 

 proportional to the extent of the aurora. Little qualitative difference shows itself 

 between the two columns, however, the ratio of the numbers in the two columns 



* In some measure, the small number of observations Ix'tween 9 hours and 19 hours is duo to the 

 fact that observations were not always made in this period. 



13 



