Instantaneous Absolute Values of the Geomagnetic Components D, H, and Z or X,Y, and Z at 1-minute Intervals for 50 Observatories Database
The file is comprised of instantaneous absolute values of the geomagnetic components D, H, and Z or X, Y, and Z at 1-minute intervals. These values were derived either from analog recordings (magnetograms) with the aid of semiautomatic digitizing equipment or from digital recordings made directly on magnetic tape. …