Electric currents above Saint‐Santin: 1. Data

This paper provides a presentation of the method used at Saint‐Santin for calculating ionospheric currents. We have compared the horizontal integrated currents with ground magnetic data, and we observe the same abnormal circulation as found by Mayaud (1965–1979). This result raises the problem of the global Sq system pattern, which cannot be identified with our Saint‐Santin data alone.