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Main Page   >   Data   >   Geomagnetic Variations   >   Indices of geomagnetic activity   >   K and С indices

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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