Numerical results obtained from an extension of D'Yakonov's (1959) exact solution for the case of a buried horizontal circular cylinder, excited by a horizontal line source of current above the surface of a uniform half-space and parallel to the axis of the buried cylinder, are analyzed. Results show the field impedance (E x /H y ), the ratio of the vertical magnetic component to the horizontal magnetic component (H z /H y ) as well as the corresponding phase differences at the surface for a range of periods (T = 0.25 to 2 hours), varying cylinder conductivity (sigma 2 = 1 to 100 Sm (super -1) ) and cylinder radii (a = 0.5 and 25 km). The results have possible application in the interpretation of long period magnetotelluric and geomagnetic measurements in auroral and equatorial electrojet regions.

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