Format Descriptions for Hourly Mean and 1-Minute Values of
Geomagnetic Field Elements — WDC-format
Format Description for Hourly Mean Values of
Geomagnetic Field Elements — WDC-format
Columns Format Description
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1-3 A3 Observatory 3-letter code.
4-5 I2 Year (last 2 digits, 82=1982).
6-7 I2 Month (01-12).
8 A1 Element (D, H, X, Y, Z, or F).
9-10 I2 Day of month (01-31).
11-12 A2 Blanks.
13-14 A2 Arbitrary.
15-16 I2 Two blanks or Century digits of the year:
Year 1887 - 18 Century,
Year 1978 - 19 Century,
Year 2014 - 20 Century .
============ Old Format ==============
15 column - International quiet or
disturbed days, Q=1, D=2
16 column - Blank for data since 1900,
8 for data before
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17-20 I4 Tabular base, in degrees for D and
in hundreds of nanoTeslas for the intensity elements.
21-116 24I4 Twenty-four 4-digit hourly mean values for the day.
The values are in tenth-minutes for D 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 we have that
hourly value (Degrees) = Tab.base + tab.value/600.
To avoid a 4-digit negative value in positions 21-116,
the tabular base will be adjusted for that day;
for example for D, one degree is subtracted from the base and 600
units are added to each of the hourly values for the day;
for the intensity elements, 500 nT are subtracted from the base and 500 nT
are added to each of the hourly values for the day.
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Format Description for 1-minute Values
of the Geomagnetic Field Elements - WDC-format
Columns Format Description
==========================================================================================
1-6 I6 Geographic Co-Latitude in 0.001 degree.
The distance from 0° up to 180° from the North geographic pole.
A decimal point is implied betweem positions 3 and 4.
7-12 I6 East Geographic Longitude in 0.001 degree.
The distance from 0° up to 360° from Greenwich.
A decimal point is implied betweem positions 9 and 10.
13-14 I2 Year. Last 2 digits, 82 = 1982. See also column 26.
15-16 I2 Month (01-12).
17-18 I2 Day of month (01-31).
19 A1 Element (D,I,H,X,Y,Z,E or F).
20-21 I2 Hour of day (00-23).
22-24 A3 Observatory's IAGA 3-letter code.
25 I1 Arbitrary. Sometimes D = Digitized from analog records.
26 I1 Century digit:
Year = 2014, Century digit = 0,
Year = 1978, Century digit = 9,
Year = 1887, Century digit = 8
or blank.
27 A1 Preliminary or Definitive data.
Preliminary = P, Definitive = D.
28-34 9A1 Blanks.
35-394 60I6 60 6-digit 1-minute values for the given element for that
data hour.
The values are in nanoTeslas for the intensity elements H,X,Y,Z,E and F,
and in tenth-minutes for D and I (612 = l degree + 1.2 minutes East).
395-400 I6 Hourly mean value - the average of the proceeding 60 one-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.
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