| COLUMN | FORMAT | SHORT DESCRIPTION |
|---|---|---|
| 1-2 | A2 | INDEX NAME ('AE','AL','AO' or 'AU') |
| 3 | 1X | BLANK |
| 4-5 | I2 | The last two digits of the year |
| 6-7 | I2 | Month |
| 8 | A1 | '*' for index |
| 9-10 | I2 | Date |
| 11-12 | A2 | All spaces or may be "RR" for quick look |
| 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, 4 digit number, unit 1 nT,
value 9999 for the missing data. 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. |