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Sonett 1978
Sonett, C.P. (1978). Evidence for a primordial magnetic field during the meteorite parent body era. Geophysical Research Letters 5: doi: 10.1029/GL005i002p00151. issn: 0094-8276.

A total of 247 measurements of natural magnetic remanence (NRM) and effective susceptibility of meteorites tabulated by Herndon et al. (1972) from Russian data is investigated. A log-log plot of p, magnetic moment/gm, versus &khgr;, susceptibility/gm, shows a straight line relation with a slope of unity over a range of meteorite types extending from the achondrites at the low Fe-Ni end to the stony-irons, and over a span in ? and ? of between four and five orders. In view of the wide variability of the different classes of meteorite and the effects of unstable soft magnetization, this relation is unexpected. One suggestion is a common background field; this supports the hypothesis of an ancient magnetic field at the time of meteorite formation. An estimate of the primordial field strength cannot be made with certainty because the field strength H=1.8/&rgr; 2N, where &rgr; is density and N is the average carrier demagnetization factor; N can vary from zero to 4&pgr;. Thus an extreme lower limit for H is 0.02 oersted for N=4&pgr;, in agreement with Brecher and Ranganayaki (1975). For the mean field of 0.27 oersted determined from critical study of individual meteorites (Stacey and Banerjee, 1974), the average N=0.74, corresponding to elongated grains.

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Geophysical Research Letters
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American Geophysical Union
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