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Format descriptions for K index data
WDC format
Line 1: from the 9th position - Observatory name and the lower limit of the disturbance amplitude for K = 9 in nT.
Line 2: 1 - 3 positions - Observatory code.
Line 3: 1 - 4 i4 Year.
6 - 7 i2 Month.
9 - 10 i2 Day.
13 - 15 i3 Day of the year.
17 - 32 8i2 Eight 3-hourly values of the index for the day.
35 - 36 i2 The sum of 8 values of the index per day.
Line 4 and all subsequent to the end of the month:
6 - 7 i2 Month.
9 - 10 i2 Day.
13 - 15 i3 Day of the year.
17 - 32 8i2 Eight 3-hourly values of the index for the day.
35 - 36 i2 The sum of 8 values of the index per day.
Then each new month begins with the 2nd line.
A missing value is identified by “-1”.
INTERMAGNET format
The following information is given at the beginning of the file:
observatory code,
geographic coordinates (optional),
the lower limit of the disturbance amplitude for K = 9 in nT,
year,
format string.
Then there are data lines in the following format:
Positions Description
4 - 5 Day of month.
6 ‘ - ‘
7 - 9 Three-letter abbreviation of the month name.
10 ‘ - ‘
11 - 12 Last two digits of the year.
16 - 18 Number of the day in the year.
23 - 24 The value of K index for a 3-hour interval.
28 - 29 The value of K index for a 3-hour interval.
33 - 34 The value of K index for a 3-hour interval.
38 - 39 The value of K index for a 3-hour interval.
45 - 46 The value of K index for a 3-hour interval.
50 - 51 The value of K index for a 3-hour interval.
55 - 56 The value of K index for a 3-hour interval.
60 - 61 The value of K index for a 3-hour interval.
69 - 70 The sum of 8 values of K index for the day.
The empty line is located after the end of the month.
A missing value is identified by “-1”.
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