IYFV1.01 INTERMAGNET CD-ROM/DVD Format For Yearmean File
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Magnetic data with 1nT or 0.1min of arc resolution are organized on a year file basis. One file contains all published annual mean values of the geomagnetic field components at a single observatory.
YEARMEAN and the three-letter observatory ID code as an extension. eg: YEARMEAN.BOU for Boulder.
Each file may have from 1 to 3 tables containing annual mean values. The file must contain a table of annual means for ALL-DAYS, but may also contain tables of annual means for QUIET-DAYS and DISTURBED-DAYS.
Description of the bloc header
The header contains information on observatory name, ID-code, Colatitude, Longitude and Elevation. It further contains the headers for each data columns. See Sample of IYFV1.01 CD-ROM/DVD yearmean file for an example.
Description of data space (75 characters per line including CrLf)
All data fields are right-justified. The field width must be maintained, either by zero-filling or space-filling. The '+'sign for positive values is optional.
||Epoch is given with 3 decimals.|
||Declination is given in degrees and decimal minutes of arc.|
||Inclination is given in degrees and decimal minutes of arc.|
||H-component is given in nT.|
||X-component is given in nT.|
||Y-component is given in nT.|
||Z-component is given in nT.|
||F-component is given in nT.|
||Type of annual means. May be All, Quiet, Disturbed, Incomplete or Jump. The J is not an annual mean value, but indicates a jump in the observatory recordings, which should be described in a note.|
||recorded elements. eg:"XYZF" or "HDZF".|
||Indicates a Carriage return, Line feed.|
Missing elements in an annual mean record should be represented with 9s. Missing angular values should be coded as three 9 digits, a space, two 9 digits a dot and one 9 digit: 999 99.9
Missing field strengths should be coded as six 9 digits: 999999
Description of the footer
At the end of the file is added a footer describing the data. The footer contains notes on jumps , incomplete data sets etc. See Sample of IYFV1.01 CD-ROM/DVD yearmean file for an example.
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