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Federal
Worldwide Instantaneous Values of Geomagnetic Components D, H, and Z or X, Y, and Z at 2.5-minute Intervals from 1964 to 1974
National Oceanic and Atmospheric Administration, Department of Commerce —
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... -
Federal
Geomagnetic Absolute Mean Values at Hourly Intervals from 220 Observatories Worldwide
National Oceanic and Atmospheric Administration, Department of Commerce —
This file is comprised of absolute mean hourly values of the geomagnetic components D, H and Z or X, Y and Z. These values, on magnetic tape, are available from...