NotePCSindexExamination-27-12-2021.pdf

The note discusses the differences between two Polar Cap South (PCS) index series both submitted from Arctic and Antarctic Research Institute (AARI) , St. Petersburg, Russia,. One PCS series is published via the AARI web portal https://pcindex.org while the other PCS series is distributed via the web portal http://isgi.unistra.fr of the International Service for Geomagnetic indices (ISGI). Both PCS series have been downloaded on 23 December 2021 for the comparisons. In principle, the two series should be identical. However, differences on the order of magnetic storm amplitude (>3 mV/m) have been detected and are reported in the present note.