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By W. H. Campbel (auth.), Wallace H. Campbell (eds.)

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LUI, A. T. , McENTIRE, R. , and KRIMIGIS, S. M. (1987), Evolution of the Ring Current during Two Geomagnetic Storms, J. Geophys. Res. 92, 7459-7470. , TARPLEY, J. , and CAMPBELL, W. H. (1973), IMF Sector Structure Effects on the Quiet Geomagnetic Field, Radio Sci. 8, 963-972. MAYAUD, P. , Derivation, Meaning, and Use of Geomagnetic Indices (Amer. Geophys. C. 1980), 153 pp. Vol. 134, 1990 Magnetospheric Disturbance Ring Current 557 McDoNALD, K. (1957), Penetration of the Geomagnetic Secular Field Through a Mantle with Variable Conductivity, J.

1973) are not presently accommodated; (4) there are small, semi diurnal lunar tidal dynamo current effects in the present Dst indices (STENNING, 1990). The magnitude of Dst, and whether it is positive or negative, depends upon the proper subtraction of the main field from the H-component values for the representative stations. The earth's main field has a nonlinear secular change. The Dst provider must decide whether to accept the accuracy of those modeling this field about every five years for charting purposes or to determine the level uniquely for the contributing observatories.

ROBERTS, B. Sc. D. thesis, University of Lancaster, 125 pp. SINGER, B. , and FAINBERG, E. , Electromagnetic Induction in Non-uniform Thin Layers (IZMI- RAN, Moscow 1985) 234 pp. (in Russian). 20/0 © 1990 Birkhiiuser Verlag, Basel PAGEOPH, Vol. 4 (1990) The Magnetospheric Disturbance Ring Current as a Source for Probing the Deep Earth Electrical Conductivity WALLACE H. CAMPBELL 1 Abstract - Two current rings have been observed in the equatorial plane of the earth at times of high geomagnetic activity.

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