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A WORLDWIDE STUDY OF THE H-VARIATION, D-VARIATION AND Z-VARIATION ON ABNORMAL QUIET DAYS (AQDS)
E. C. Butcher, H. McCreadie, D. M. Schlapp Published for the Royal Astronomical Society, the Deutsche Geophysikalische Gesellschaft, and the European Geophysical Society by Blackwell Scientific Publications 1993 Geophysical journal international Vol.114 No.1
THE ANNUAL VARIATION OF THE NIGHTTIME VALUES OF THE GEOMAGNETIC-FIELD
E. C. Butcher, D. M. Schlapp Published for the Royal Astronomical Society, the Deutsche Geophysikalische Gesellschaft, and the European Geophysical Society by Blackwell Scientific Publications 1992 Geophysical journal international Vol.111 No.1