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The geomagnetic jerk of 1969 and the DGRFs

January 1, 1987

Cubic spline fits to the DGRF/IGRF series indicate agreement with other analyses showing the 1969-1970 magnetic jerk in the h ??12 and g ??02 secular change coefficients, and agreement that the h ??11 term showed no sharp change. The variation of the g ??01 term is out of phase with other analyses indicating a likely error in its representation in the 1965-1975 interval. We recommend that future derivations of the 'definitive' geomagnetic reference models take into consideration the times of impulses or jerks so as to not be bound to a standard 5 year interval, and otherwise to make more considered analyses before adopting sets of coefficients. ?? 1987.

Publication Year 1987
Title The geomagnetic jerk of 1969 and the DGRFs
DOI 10.1016/0031-9201(87)90163-4
Authors D. Thompson, J.C. Cain
Publication Type Article
Publication Subtype Journal Article
Series Title Physics of the Earth and Planetary Interiors
Index ID 70014204
Record Source USGS Publications Warehouse