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1983, Ronald T. Merrill, Michael W. McElhinny, The Earth's Magnetic Field: Its History, Origin, and Planetary Perspective, Academic Press, page 135:
David (1904) and Brunhes (1906) first observed magnetizations in lava flows that were roughly opposed to that of the present earth's magnetic field.
1996, V. R. Khalilov, Electron Strong Magnetic Field, , Gordon and Breach Science Publishers, page 123,
In contrast to the IQHE, the fractional quantum Hall effect occurs in much stronger magnetic fields, and in this case electrons cannot be considered as noninteracting ones.
The magnetic fieldB bears the same relation to a hypothetical magnetic charge m as the electric field bears to the electric charge q, so the development of the previous chapter can be taken over completely. The stress tensor for a magnetic fieldBi is identical in form to that for the electric field. The energy density is obviously B2/8π and the magnetic field is a physical reality just like the electric field. Electric and magnetic fields superpose linearly[…]. This is perhaps a convenient place to remark that a magnetic field exerts no force whatever on an electric charge.
The turian homeworld, Palaven, has a metal-poor core, generating a weak magnetic field and allowing more solar radiation into the atmosphere.
2023 November 15, Prof. Jim Wild, “This train was delayed because of bad weather in space”, in RAIL, number 996, page 30:
The scientific instruments of the day recorded rapid fluctuations in the Earth's magnetic field, as powerful electrical currents flowed through the upper atmosphere.
magnetic field on Wikipedia.Wikipedia 