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. The only published description of the solar wind sector(SS) term used for the reference level in the post-event and real-timederivation of the Polar Cap (PC) indices, PCN (Polar Cap North) and PCS (Polar Cap South), inthe version endorsed by the International Association for Geomagnetism andAeronomy (IAGA) is found in the commented publication, Janzhura andTroshichev: Identification of the IMF sector structure in near-real time byground magnetic data, Annales Geophysicae, 29, 1491–1500, 2011. Actually, thepublication has served as a basis for the index endorsement by IAGA in 2013.However, neither the illustrations nor the results presented there have beenderived by the specified near real-time method. Figures 1, 6, 7, and 8 displayvalues derived by post-event calculations based on daily medians smoothedover 7 d centred on the day of interest. Figures 2, 3, and 4 displayobserved values smoothed over 7 d, while the remaining Fig. 5 displaysaverages over 4 months. In summary, there are strong disagreements betweenindications in the title, abstract, and statements in the text compared tothe actual results and their illustrations.

Comment on “Identification of the IMF sector structure in near-real time by ground magnetic data” by Janzhura and Troshichev (2011)