This is the ftp-server of the World Data Centre for Geomagnetism Copenhagen (WDC Copenhagen). The WDC Copenhagen is operated by DTU Space, the National Space Institute at the Technical University of Denmark. Data in folder 'indices': pcn: The PCN-index is provided by DTU Space. kp-ap: The Kp index, related indices and material are provided by GFZ Helmholtz Centre Potsdam. The Geomagnetic Data Master Catalog was developed at WDC Copenhagen and is now available from WDC for Geomagnetism, Edinburgh. Contact: Anna Willer DTU Space National Space Institute Technical University of Denmark Centrifugevej Building 356 2800 Kgs. Lyngby Denmark Ph. +45 45 25 97 06 email: anna@space.dtu.dk