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<p><strong>Abstract.</strong> The Polar Cap (PC) indices were approved by the International Association for Geomagnetism and Aeronomy (IAGA) in 2013 and made available at the web portal <a href="http://pcindex.org" target="_blank">http://pcindex.org</a> holding prompt (real-time) as well as archival index values. The present note provides the first reported examination of the validity of the IAGA-endorsed method to generate real-time PC index values. It is demonstrated that features of thedoi:10.5194/angeo-36-621-2018 fatcat:exdqzt2bbndo5m56djcc3ygeja