The electrical conductivity of the Earth and planets

In addition to a review of global induction studies of the Earth, the results of recent investigations of the electrical conductivity of the lunar interior are presented. Information on the magnetic environment of Venus, Mercury, Mars and Jupiter is tabulated, there being insufficient data to infer their electrical conductivity. Regional induction studies of the Earth's crust and upper mantle using geomagnetic deep-sounding and magnetotelluric techniques are summarised with a fuller discussion of studies in the UK and Kenya. The instrumentation used in observatory, field and laboratory studies is described.