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I n t r o d u c t i o n 295 1 * 3* D y n a m o t h e o r y f o r a n a r b i t r a r y R e f e r e n c e s 305 Assuming semi-diurnal tidal air flow a solution is made of the atmospheric dynamo problem, taking account both of the direct and transverse conductivities of the ionosphere. The spherical sheet ionosphere is divided into three regions, a narrow equatorial zone, and two wide polar caps, taking appropriate constant conductivities in each region. The current system is similar in shape anddoi:10.1098/rsta.1953.0017 fatcat:zesuizjkc5d7ticpbowhpwr4di