Comment on use of anomalous stations for IMS


  • P. A. Canfield,

  • D. I. Gough


One of us has recently reviewed the general problem of the effects of induction in the earth upon the measurement of external time-varying magnetic fields [Gough, 1974]. In this context we are concerned about the inclusion of Rapid City, South Dakota, and Alert and Mould Bay, N.W.T., Canada, in magnetometer networks for the International Magnetospheric Study, as described by Lanzerotti et al [1976]. Inhomogeneities in the electrical conductivity of the earth's crust cause drastic distortions in the variation fields recorded at these stations.