Preprints
https://doi.org/10.5194/angeo-2020-53
https://doi.org/10.5194/angeo-2020-53

  04 Dec 2020

04 Dec 2020

Review status: a revised version of this preprint was accepted for the journal ANGEO and is expected to appear here in due course.

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

Peter Stauning Peter Stauning
  • Danish Meteorological Institute, Lyngbyvej 100, Copenhagen

Abstract. The only published description of the solar wind sector (SS) term used for the reference level in the post-event and real-time derivation of the Polar Cap (PC) indices, PCN (North) and PCS (South), in the version endorsed by the International Association for Geomagnetism and Aeronomy (IAGA) is found in the commented publication, Janzhura and Troshichev (2011): Identification of the IMF sector structure in near-real time by ground magnetic data, Annales Geophysicae, 29, 1491–1500. Actually, the publication has served as basis for the index endorsement by IAGA in 2013. However, neither the illustrations nor the results presented there have been derived by the specified near-real time method. Figs. 1, 6, 7, and 8 display values derived by post-event calculations based on daily medians smoothed over 7 days centred on the day of interest. Figs. 2, 3, and 4 display observed values smoothed over 7 days, while the remaining Fig. 5 displays averages over 4 months. In summary, there are strong disagreements between indications in the title, abstract, and statements in the text compared to the actual results and their illustrations.

Peter Stauning

 
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement

Peter Stauning

Peter Stauning

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Short summary
The commented publication by Janzhura and Troshichev (2011) constitute basis for IAGA endorsement by Resolution 3 (2013) of PC index calculations. However, there is strong disagreement between indications in the title, abstract, statements in the text, and figure captions, as well as in illustrations of results compared to re-calculations of the relations by rigorous use of the presented near-real time procedure. Against their statements, none of the illustrations present near-real time methods.