Ionospheric quiet-day currents and their effects on the interpretation of upper mantle conductivity: A review

A review of ionospheric currents,the external part of geomagnetic solar quiet (Sq)variation and the internal part of the induced currentwithin the Earth, has been carried out.The theoretical background has been reviewed,and the method of analysis, specificallythe spherical harmonic analysis (SHA),is...

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Bibliographic Details
Published in:Surveys in geophysics 2000-01, Vol.21 (5-6), p.487-498
Main Author: OKEKE, F. N
Format: Article
Language:English
Subjects:
Earth sciences
Earth, ocean, space
Exact sciences and technology
Geophysics: general, magnetic, electric and thermic methods and properties
Harmonic analysis
Internal geophysics
Upper mantle
Online Access:Get full text
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Summary:A review of ionospheric currents,the external part of geomagnetic solar quiet (Sq)variation and the internal part of the induced currentwithin the Earth, has been carried out.The theoretical background has been reviewed,and the method of analysis, specificallythe spherical harmonic analysis (SHA),is presented. Various works are reviewed andfully discussed. It has been noted that anew model of the Sq current system could beused to obtain a mantle electrical conductivityprofile for hemispheres. It is suggested thatfurther research work be carriedout in other hemispheres using similarmodels for more robust interpretations.[PUBLICATION ABSTRACT]
ISSN:0169-3298
1573-0956
DOI:10.1023/A:1006753330588