Magnetic dipole moment of a spherical shell with TRM acquired in a field of internal origin

Details Magnetic dipole moment of a spherical shell with TRM acquired in a field of internal origin Magnetic dipole moment of a spherical shell with TRM acquired in a field of internal origin

Jan 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976pepi...11..184s&link_type=abstract

Physics of the Earth and Planetary Interiors, vol. 11, no. 3, Jan. 1976, p. 184-190.

Physics

17

Dipole Moments, Lunar Magnetic Fields, Magnetic Moments, Magnetization, Remanence, Spherical Shells, Lunar Rocks, Magnetic Permeability, Magnetostatic Fields

Scientific paper

The acquisition of thermoremanent magnetization (TRM) by a cooling spherical shell is studied for internal magnetizing dipole fields, using Runcorn's (1975) theorems on magnetostatics. If the shell cools progressively inward, inner regions acquire TRM in a net field composed of the dipole source term plus a uniform field due to the outer magnetized layers. In this case, the global dipole moment and external remanent field are nonzero when the whole shell has cooled below the Curie point and the source dipole has disappeared. The remanent field outside the shell is found to depend on the thickness, radii, and cooling rate of the shell, as well as the coefficient of TRM and the intensity of the magnetizing field. Some implications for the moon's remanent dipole moment are discussed.

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