Articles | Volume 36, issue 2
Regular paper
16 Apr 2018
Regular paper |  | 16 Apr 2018

A critical note on the IAGA-endorsed Polar Cap (PC) indices: excessive excursions in the real-time index values

Peter Stauning

Related authors

Comment on “Identification of the IMF sector structure in near-real time by ground magnetic data” by Janzhura and Troshichev (2011)
Peter Stauning
Ann. Geophys., 39, 369–377,,, 2021
Short summary
Comment on Invariability of relationship between the polar cap magnetic activity and geoeffective interplanetary electric field by Troshichev et al. (2011)
Peter Stauning
Ann. Geophys. Discuss.,,, 2020
Preprint withdrawn
Short summary
Comments on quiet daily variation derivation in "Identification of the IMF sector structure in near-real time by ground magnetic data" by Janzhura and Troshichev (2011)
P. Stauning
Ann. Geophys., 31, 1221–1225,,, 2013
Short summary
The Polar Cap (PC) indices, PCN (North) based on magnetic data from Qaanaaq (Thule) and PCS (South) based on Vostok data, reflect the transpolar convection of plasma and magnetic fields. The PC indices could be used, among others, to indicate the energy transfer from the solar wind to the magnetosphere–ionosphere–thermosphere system in space weather monitoring applications. The present IAGA-endorsed methods to derive PC indices in real time are found to generate inconsistent index values.