The time-varying geomagnetic field

Details The time-varying geomagnetic field The time-varying geomagnetic field

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987rvgeo..25..929v&link_type=abstract

Reviews of Geophysics (ISSN 8755-1209), vol. 25, June 1987, p. 929-938. Research supported by the National Research Council.

Physics

6

Geomagnetism, Magnetic Variations, Secular Variations, Approximation, Earth Core, Earth Mantle, Field Theory (Physics), Flow Velocity

Scientific paper

Information (obtained from Magsat and other sources) published by the U.S. authors between 1983 and 1986 on the large-scale geomagnetic field of deep internal origin and its secular variation (SV) is reviewed. Results on the main field modeling, including reference fields, and on the separaton of core and crustal fields are discussed together with the advances made in geomagnetic field theory and applications of novel methods. Consideration is also given to global SV, short-term global SV, and regional CV analyses; nonsecular impulses, featuring the sudden geomagnetic jerk of 1969; and the frozen-flux core approximation, including downward continuation to the core-mantle boundary constraints, westward drift, and estimates of the fluid velocity at the top of the core.

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