INNER CORE ANISOTROPY, ANOMALIES IN THE TIME-AVERAGED PALEOMAGNETIC FIELD, AND POLARITY TRANSITION PATHS
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dc.contributor.author | Clement B.M. | |
dc.contributor.author | Stixrude L. | |
dc.date.accessioned | 2020-11-25T11:05:50Z | |
dc.date.available | 2020-11-25T11:05:50Z | |
dc.date.issued | 1995 | |
dc.identifier | https://elibrary.ru/item.asp?id=658815 | |
dc.identifier.citation | Earth and Planetary Science Letters, 1995, , 1, 75-85 | |
dc.identifier.issn | 0012-821X | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/19520 | |
dc.description.abstract | The diffusion of the dynamo-generated magnetic field into the electrically conducting inner core of the Earth may provide an explanation for several problematic aspects of long-term geomagnetic field behavior. We present a simple model which illustrates how an induced magnetization in the inner core which changes on diffusive timescales can provide a biasing field which could produce the observed anomalies in the time-averaged field and polarity reversals. The Earth's inner core exhibits an anisotropy in seismic velocities which can be explained by a preferred orientation of a polycrystalline aggregate of hexagonal close-packed (hcp) iron, an elastically anisotropic phase. Room temperature analogs of hcp iron also exhibit a strong anisotropy of magnetic susceptibility, ranging from 15 to 40% anistropy. At inner core conditions the magnetic susceptibility of hcp iron is estimated to be between 10-4 and 10-3 SI. We speculate here that the anisotropy in magnetic susceptibility in the inner core could produce the observed anomalies in the time-averaged paleomagnetic field, polarity asymmetry, and recurring transitional virtual geomagnetic pole (VGP) positions. | |
dc.title | INNER CORE ANISOTROPY, ANOMALIES IN THE TIME-AVERAGED PALEOMAGNETIC FIELD, AND POLARITY TRANSITION PATHS | |
dc.type | Статья |
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