COLUMNS | FORMAT | DESCRIPTION |
---|---|---|

1-3 | A3 | OBSERVATORY 3-LETTER CODE, left adjused |

4-5 | I2 | YEAR (last 2 digits, 82 = 1982) |

6-7 | I2 | MONTH (01-12) |

8 | A1 | ELEMENT(D,H,X,Y,Z,or F) |

9-10 | I2 | DAY OF MONTH (01-31) |

11-12 | A2 | Blanks |

13-14 | A2 | Arbitrary |

15 | A1 | INTERNATIONAL QUIET or DISTURBED DAYS, Q=1,D=2 |

16 | I1 | Blank for data since 1900,8 for data before |

17-20 | I4 | Tabular base, in degrees for D and I,
hundreds of nanoTeslas (gammas) for the intensity elements.
The bases are right adjusted and signed if negative.
Negative values are identified with a minus sign
either adjacent to the first significant digit or in the high-order
position of the field (position 17). NOTE: A blank digit will not appear between a (-) sign and the first significant digit. For example, a base may appear as -050 or b-50 but not as -b50(b=blank). |

21-116 | 24I4 | Twenty-four 4-digit Hourly Values for the day. The values are in tenth-minutes for D and in nanoTeslas (gammas) for the intensity elements. The first hourly value represents the mean value between 00:00 UT and 01:00 UT, ..., the 24th value represents the mean between 23:00 UT and 24:00 UT. Rules for negative values are the same as those described for tabular bases. A missing value is identified by 9999. |

117-120 | I4 | Daily Mean. Rules for negative values are the same as those described for tabular bases. If any of the hourly mean values for the day are missing 9999 will appear as the daily mean. |

The 25 values in positions 21-120 will have the range -999 to 9998, with 9999 reserved for missing values. To avoid a 4-digit negative value in positions 21-116, the tabular base will be adjusted for that day; for example for D, one degree is subtracted from the base and 600 units are added to each of the hourly values for the day - for the intensity elements, 500 nT are subtracted from the base and 500 nT are added to each of the hourly values for the day. Each tape block contains 20 records (2400 characters). A standard inter-record gap appears between tape blocks. When necessary, all nines are used as padding to complete the last block of data. Two or more tape marks follow the last block of data. The records are sorted according to observatory code, year, month, element, day (positions 1-10).