|Worldwide Instantaneous Values of Geomagnetic Components D, H, and Z or X, Y, and
Z at 2.5-minute Intervals from 1964 to 1974
|This data file is comprised of instantaneous values of the geomagnetic components
D, H, and Z or X, Y, and Z at 2.5-minute intervals. These values were derived from
analog recordings (magnetograms) with the aid of semi-automatic digitizing equipment
from a worldwide network of about 75 observatories.