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The following is format information for the AAIMF diskettes. The
diskettes cover the period from 1974-present. There is one format change in
that period; after 1980 the values for AM,AN,AS are included in the table.
Before 1980 these values are not included in the chart and the space is
left blank in the format. The aaimfYY files contain data for the year YY.

Space Contents

1-2 YEAR
3-4 MONTH
5-6 DAY
7-8 BLANK
9-12 N (THE NORTHERN HEMISPHERE aa DAILY VALUE)
13-15 BLANK
16-19 S (THE SOUTHERN HEMISPHERE aa DAILY VALUE)
20-22 BLANK
23-26 M1 (HALF DAILY VALUE OF aa INDICES FOR THE GREENWICH DAY)
27-29 BLANK
30-33 M2 (SECOND HALF DAILY VALUE OF aa INDICES FOR GREENWICH DAY)
34-36 BLANK
37-38 CC_OR_K (QUIET DAYS CLASSIFICATION)
39-41 BLANK
42-43 VOS (INTERPLANETARY MAGNETIC FIELD REPORTED BY VOSTOK)
44-46 BLANK
47-48 THU (INTERPLANETARY MAGNETIC FIELD REPORTED BY THULE)
49-50 BLANK
51-53 Am (DETERMINED FROM THE EIGHT DAILY am INDICIES)
54 BLANK
55-57 An (DETERMINED USING ONLY NORTHERN HEMISPHERE STATIONS)
58 BLANK
59-61 As (DETERMINED USING ONLY SOUTHERN HEMISPHERE STATIONS)

Indices values in the chart are expressed in gammas.The values of VOS and
THU are either, T or A, for toward and away from the sun respectively.

MONTHLY MEAN DATA: Loacated after the last day of the month.

Space Contents

1-2 YEAR
3-4 MONTH
5-6 40 - indicator of the monthly mean values.
7-8 BLANK
9-13 Mean N (THE NORTHERN HEMISPHERE aa DAILY VALUE) Divide value by 10
to obtain the mean.
14-15 BLANK
16-20 Mean S (THE SOUTHERN HEMISPHERE aa DAILY VALUE) Divide value by 10
to obtain the mean.
21-22 BLANK
23-27 Mean M1 (HALF DAILY VALUE OF aa INDICES FOR THE GREENWICH DAY)
Divide the value by 10 to obtain the mean.
28-50 BLANK
51-54 Mean Am (DETERMINED FROM THE EIGHT DAILY am INDICIES)
Divide the value by 10 to obtain the mean.
55-58 Mean An (DETERMINED USING ONLY NORTHERN HEMISPHERE STATIONS)
Divide the value by 10 to obtain the mean.
59-62 Mean As (DETERMINED USING ONLY SOUTHERN HEMISPHERE STATIONS)
Divide the value by 10 to obtain the mean.