EASYM data format

A simple data format containing observed magnetics values and the date and Greenwich Mean Time of the observation. Data in this format were generally digitized by hand (i.e., entered via keypunch or computer terminal).

An EASYM data format file consists of an arrangement of the three following record types. Data files will always contain a record-type 1 at the beginning of the file or when there is a change in date or timezone. A record-type 1 is always followed by one or more type 2 records which will contain the magnetics value and the time of the observation. These records are followed by a record-type 3 when there is a change in date or time zone. Data fields within the records were to be separated by a space or comma.

There are no EASYM formatted data on the R/V FAY CD-ROM

Record-type 1:

     COLS      FIELD NAME                             FORMAT
     ----      --------------------------------       ------
     1-2       day                                     I2
     4-5       month                                   I2
     7-8       year                                    I2
     10-12     time zone                               I3

Record type 2:

     COLS      FIELD NAME                             FORMAT
     ----      --------------------------------       ------
     1-4       time of day (GMT as HHMM)               I4
     1-2       hour of day                             I2
     3-4       minutes of day                          I2
     7-10      observed magnetic value (gammas)        F4.1

Record-type 3:

     COLS      FIELD NAME                             FORMAT
     ----      --------------------------------       ------
     1-2       change indicator 99                     I2

EASYM example:

          1 1
 123456789012
 ------------
 22 06 76 +04
 1916  -529
 1921  -531
 1926  -531
 1931  -526
 1936  -514
 1941  -511
 1946  -498
 1951  -490
 1956  -487
 2001  -489
 2006  -490
 2011  -490
 2016  -499

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