Eliminating large-scale magnetospheric current perturbations from long-term geomagnetic observatory data

Leonie Pick, Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Potsdam, Germany and Monika C Korte, Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences, Section 2.3 – Geomagnetism, Potsdam, Germany