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      One-Second Geomagnetic Field Data Format  (Kakioka Magnetic Observatory)
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Station: Kakioka

Record Format:

   The logical record length is 512 bytes, 256 words by 2-byte integer (I*2).
   Contents of each record are described in  Table MS-1.

Data:
  
   The following four elements of the magnetic field are included.

     F: Total force
     H: Horizontal intensity (Northward)
     Z: & Vertical intensity (Downward)
     D: Declination (Westward)

Absolute values at s-th second, F(s), H(s), Z(s) and D(s), are calculated as follows;

     F(s) = F'(s)�~0.01 + F_B�~10   (nanoteslas)
     H(s) = H'(s)�~0.01 + H_B�~10   (nanoteslas)
     Z(s) = Z'(s)�~0.01 + Z_B�~10   (nanoteslas)
     D(s) = D'(s)�~0.001+ D_B�~10   (minutes).

Resolution of the data is 0.1 nT (0.01 nT) for F, H, and Z, and 0.01 minutes
    (0.001 minutes) for D until May, 1993 (after June, 1993), respectively.

Note that artificial disturbances are not always corrected.


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 Table MS-1:  Contents of each record in one-second magnetic field data of Kakioka.

      word  bytes  type     contents
-----------------------------------------------------------------
        1     2   integer  year (1983, 1984, ...)
        2     2   integer  month (1, 2, ..., 12)
        3     2   integer  day (1, 2, ..., 31)
        4     2   integer  hour (0, 1, ..., 23)
        5     2   integer  minute (0, 1, ..., 59)
        6     2   integer  serial day in the year  (1, 2, ..., 366)
        7     2   integer  serial minute in the day  (1, 2, ..., 1440)
        8     2            space
        9     2   integer  offset value of the F-component (F_B) *
       10     2   integer  offset value of the H-component (H_B) *
       11     2   integer  offset value of the Z-component (Z_B) *
       12     2   integer  offset value of the D-component ({D_B) *
       13-16  8            space
       17     2   integer  1-second value of the F-component at 0th second (F'(0)) *
       18     2   integer  1-second value of the H-component at 0th second (H'(0)) *
       19     2   integer  1-second value of the Z-component at 0th second (Z'(0)) *
       20     2   integer  1-second value of the D-component at 0th second (D'(0)) *
       21     2   integer  1-second value of the F-component at 1st second (F'(1)) *
       22     2   integer  1-second value of the H-component at 1st second (H'(1)) *
       23     2   integer  1-second value of the Z-component at 1st second (Z'(1)) *
       24     2   integer  1-second value of the D-component at 1st second (D'(1)) *
        .......................................................................... 
        ..........................................................................
      253     2   integer  1-second value of the F-component at 59th second (F'(59)) *
      254     2   integer  1-second value of the H-component at 59th second (H'(59)) *
      255     2   integer  1-second value of the Z-component at 59th second (Z'(59)) *
      256     2   integer  1-second value of the D-component at 59th second (D'(59)) *

* Data missing code is -1 until March, 1993, and 32767 after April, 1993.