**Author details**

Peter Stauning Danish Meteorological Institute, Copenhagen, Denmark

\*Address all correspondence to: pst@dmi.dk

© 2022 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

*Magnetospheric Current Systems and the Polar Cap Index DOI: http://dx.doi.org/10.5772/intechopen.104573*
