Distribution and the secular variation of terrestrial magnetism; No. II

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ID: 300828
1895
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Abstract
IN the present communication it is the intention to endeavor to localize the chief cause of asymmetry or distortion in the earth's magnetic field.In a subsequent paper a similar attempt will be made with respect to the secular variation.How shall we formulate our problem ?We do not as yet know conclusively wlzetlter the earth i8 a magnet 01' an electromagnet-i.e., whether the earth acts upon a freely suspended magnetic needle as a permanently magnetized body, with definite magnetic poles or centers of attmction, or whether it acts like a soft piece of iron rendered temporarily magnetic by a current of electricity circulating around it.To put the matter tersely, no satisfactory answer has as yet been given to the question: "I8 the earth'8 magneti8m permanent 01' ind~UJed?"A priori one might be led to the latter opinion.Forif we recall that the intensity of the magnetization of the earth can be easily compared with that which we produce with great difficulty in stcel magnets and consider the force necessary to increase the magnetization or diminish it, it would seem that the mighty disturbances, termed magnetic storms, which at times simultaneously affect the whole geomagnetic field, would not so readily result if the greater part of the earth's field were in a permanent state.We must have apparently a more sensi• tive field-one readily susceptible to chanO'e.Peter Barlow in reviewing Biot's, ~aft's and his own researches in 1831 arrived at the following conclusions :-t
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Authors L. A. Bauer
Journal american journal of science
Year 1895
DOI
10.2475/ajs.s3-50.297.189
URL
https://doi.org/10.2475/ajs.s3-50.297.189
Keywords Keywords not found

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