Type:		Journal, Article
Title:		A possible cause of the Earth's magnetism and a theory of its variations
Author(s):		Sutherland, W.
Date:		1900
Abstract:		For an electrically neutral Earth, having (larger) charge distributions of opposite sign at different radii, there would be no external electric field, but rotation would give the observed surface magnetic field. There would then be very large internal electric fields, of the order of 1010 V/m, but "it is quite probable that a solid dielectric in the Earth could stand this". There is only vague speculation about the origin of the charge separation. (He also speculates on the production of the non-dipole field, the daily variation, and magnetic storms.)
Journal (full):		Journal of Terrestrial Magnetism and Atmospheric Electricity
Volume:		5
Start Page:		73
End Page:		83
Link (full):		http://onlinelibrary.wiley.com/doi/10.1029/TE005i002p00073/abstract