The values of the AE, AU, AL, AO indices are calculated and made available by 
the World Data Center for Geomagnetism, Kyoto 

Citation: 
World Data Center for Geomagnetism, Kyoto, Nose M., Iyemori T., Sugiura M. and Kamei T. 
(2015) - Geomagnetic ÀÅ index, doi:10.17593/15031-54800.


Format description for hourly values of AE, AU, AL, AO indices

Column  Format  Description
=================================================================================
  1-2    A2    Index name: AE, AU, AL or AO.
  3            Blank.                            
  4-5    I2    Year (last 2 digits, 82=1982).                        
  6-7    I2    Month. 
  8      I1    '*' for index.
  9-10   I2    Day. 
 11-12   A2    Blanks.
 13      A1    'X' for index.
 14      A1    Version: 
               0 - quicklook, 1 - provisional, 2 - final, 
               3 and up: corrected final or may be space for final.                                
 15-16   I2    Top two digits of the year (19 or space for 19XX, 20 from 2000).        
 17-20   I4    Base value, unit 100 nT. 
 21-116  24I4  24 hourly values for the day, 4-digit number, in nT. 
               A missing value is identified by 9999.
               First data is for the first hour of the day, 
               and last data is for the last hour of the day.
  117-120 I4   Daily mean value, unit 1 nT. Value 9999 for the missing data. 

   Note: To calculate the absolute value, the base value should be multiplied 
         by 100 and added to each hourly value of the index and to the daily mean.
==================================================================================