DIGITAL WDC EXCHANGE FORMAT FOR OBSERVATORY HOURLY MEAN VALUES

Magnetic data organized in 1-year files, with the information coded in ASCII.


COLUMNS   FORMAT   DESCRIPTION

1-3       A3       Observatory 3-letter code
4-5       I2       Year. Last 2 digits, 1996 = 96. See also columns 15-16.
6-7       I2       Month (01-12)
8         Al       Element (D,I,H,X,Y,Z, or F)
9-10      I2       Day of month (01-31)
11-12     A2       Blanks
13        A1       Arbitrary   
14        A1       Arbitrary                              *== OLD FORMAT ==========================*
15-16     I2       Century digits                         | Column 15: INTERNATIONAL QUIET         |
                   Year = 1889, Century digits = 18       |            or DISTURBED DAYS Q=1, D=2  |
                   Year = 1996, Century digits = 19       | Column 16: Blank for data since 1900,  |
                   Year = 2014, Century digits = 20       |            8 for data before.          |
17-20     I4       Tabular base.                          *========================================*
                   The values are in degrees for D and I, and in 
                   hundreds of nanoTeslas for the intensity elements. 
21-116    24I4     24 4-digit hourly mean values for the day. 
                   The values are in tenth-minutes for D and I, and in
                   nanoTeslas for the intensity elements.
                   The first hourly mean value represents the mean value 
                   between 00:00 UT and 01:00 UT, ..., the 24th value 
                   represents the mean between 23:00 UT and 24:00 UT.
                   A missing value is identified by 9999.
117-120   I4       Daily Mean. 
                   If any of the hourly mean values for the day are missing 
                   9999 will appear as the daily mean.
121-122            Record end marker.
                   Two chars 'cr'= 13 and 'nl'= 10.

The tabular bases, hourly mean values and daily means are right adjusted and 
signed if negative. 
Negative values are identified with a minus sign either adjacent to the first 
significant digit or in the high-order position  of the field. 
NOTE: A blank digit will not appear between a (-) sign and the first 
significant digit. For example, a value may appear as -050 or b-50 but not 
as -b50 (b=blank).

The 25 values in positions 21-120 will have the range -999 to 9998, with 9999 
reserved for missing values. 

The records are sorted according to observatory code, year, month, element,
day (positions 1-10).

For the intensity elements we have that
     hourly value (nanoTeslas) = tab.base*100 + tab.value

For the angles D and I we have that
     hourly value (Degrees) = tab.base + tab.value/600

DIGITAL WDC EXCHANGE FORMAT FOR OBSERVATORY 1-MINUTE VALUES

Magnetic data organized in 1-month files, with the information coded in ASCII.


COLUMNS   FORMAT   DESCRIPTION

1-6       I6       Observatory's North Polar distance.  
                   0 to 180 degrees from the north geographic pole in thousandths 
                   of a degree. Decimal point is implied between positions 3 
                   and 4.
7-12      I6       Observatory's Geographic longitude.  
                   0 to 360 degrees measured east from Greenwich in thousandths 
                   of a degree. Decimal point is implied between positions 9 
                   and 10.
13-14     I2       Year. Last 2 digits, 1996 = 96. See also column 26.
15-16     I2       Month (01-12)
17-18     I2       Day of month (01-31)
19        Al       Element (D,I,H,X,Y,Z, or F)
20-21     I2       Hour of day (00-23)
22-24     A3       Observatory 3-letter code.
25        A1       Arbitrary.
26        I1       Century digit.
                   Year = 2014, Century digit = 0.
                   Year = 1889, Century digit = 8.
                   Year = 1996, Century digit = 9 or 'SPACE' for backwards
                   compatibility.
27        A1       Preliminary or Definitive data.
                   Preliminary = P , Definitive = D
28-34     A7       Blanks
35-394    60I6     60 6-digit 1-minute values for the given element for that
                   data hour.
                   The values are in tenth-minutes for D and I, and in
                   nanoTeslas for the intensity elements.
395-400   I6       Hourly Mean.
                   The average of the preceeding 60 1-minute values.
401-402            Record end marker.
                   Two chars 'cr'= 13 and 'nl'= 10.

Each element value and the hourly mean is given in a 6-digit field including
a minus sign for negative values.

Missing data value spaces are padded with 999999.

The records are sorted according to observatory code, year, month, day,
element.