The evolution of the earth's magnetic field

Details The evolution of the earth's magnetic field The evolution of the earth's magnetic field

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989sciam.261...68b&link_type=abstract

Scientific American (ISSN 0036-8733), vol. 261, Dec. 1989, p. 68-75.

Physics

4

Earth Core, Fluid Flow, Geomagnetism, Geophysical Fluids, Magnetic Field Inversions, Planetary Evolution, Iron, Lines Of Force, Magnetic Dipoles, Magnetic Flux, Magnetoactivity

Scientific paper

During the past nine years, a Harvard University group has succeeded in mapping the magnetic field at the boundary between the earth's core and mantle. A mathematical method was developed to find the least complicated core-surface map that could be projected from measurements at the earth's surface. Maps of magnetic activity at the core surface link fluid flow to the evolution of the field. These maps have revealed remarkable, unknown features of the earth's magnetic field and have elucidated the geodynamo, the process that maintains the field. The geomagnetic field at the core surface shares some characteristics with a dipole field. Yet, the core-surface field differs from a dipole field in many respects. A method whose history extends back to 1965 is utilized to determine fluid flow directly from surface measurements of the field.

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