ELECTROMAGNETIC RESPONSE OF AN EMBEDDED CYLINDER FOR LINE CURRENT EXCITATION

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 equals 0. 25 to 2 hours), varying cylinder conductivity ( sigma //2 equals 1 to 100 Sm** minus **1) and cylinder radii (a equals 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.