Steady Induction Effects in Geomagnetism. Part 1A: Steady Motional Induction of Geomagnetic Chaos PDF Download
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Languages : en
Pages : 36
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Author:
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ISBN:
Category :
Languages : en
Pages : 36
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Book Description
Author:
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ISBN:
Category :
Languages : en
Pages : 36
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Category : Aeronautics
Languages : en
Pages : 556
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Category :
Languages : en
Pages : 32
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Author: National Aeronautics and Space Adm Nasa
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ISBN: 9781728934952
Category :
Languages : en
Pages : 36
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Book Description
Geomagnetic effects of magnetic induction by hypothetically steady fluid motion and steady magnetic flux diffusion near the top of Earth's core are investigated using electromagnetic theory, simple magnetic earth models, and numerical experiments with geomagnetic field models. The problem of estimating a steady fluid velocity field near the top of Earth's core which induces the secular variation indicated by broad-scale models of the observed geomagnetic field is examined and solved. In Part 1, the steady surficial core flow estimation problem is solved in the context of the source-free mantle/frozen-flux core model. In the first paper (IA), the theory underlying such estimates is reviewed and some consequences of various kinematic and dynamic flow hypotheses are derived. For a frozen-flux core, fluid downwelling is required to change the mean square normal magnetic flux density averaged over the core-mantle boundary. For surficially geostrophic flow, downwelling implies poleward flow. The solution of the forward steady motional induction problem at the surface of a frozen-flux core is derived and found to be a fine, easily visualized example of deterministic chaos. Geomagnetic effects of statistically steady core surface flow may well dominate secular variation over several decades. Indeed, effects of persistent, if not steady, surficially geostrophic core flow are described which may help explain certain features of the present broad-scale geomagnetic field and perhaps paleomagnetic secular variation. Voorhies, Coerte V. Goddard Space Flight Center ...
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Category : Aeronautics
Languages : en
Pages : 122
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Author: Coerte V. Voorhies
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Category : Earth (Planet)
Languages : en
Pages : 20
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Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 134
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ISBN:
Category : Government publications
Languages : en
Pages : 1070
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Author: United States. Superintendent of Documents
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Category : Government publications
Languages : en
Pages : 1068
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Book Description
February issue includes Appendix entitled Directory of United States Government periodicals and subscription publications; September issue includes List of depository libraries; June and December issues include semiannual index
