Annales Geophysicae
Annales Geophysicae
ANGEO
Articles | Volume 33, issue 11
Articles | Volume 33, issue 11
https://doi.org/10.5194/angeo-33-1443-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/angeo-33-1443-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Articles | Volume 33, issue 11
Regular paper
 | 
30 Nov 2015
Regular paper |  | 30 Nov 2015

A critical note on the IAGA-endorsed Polar Cap index procedure: effects of solar wind sector structure and reverse polar convection

P. Stauning

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Short summary
Polar Cap (PC) index values are derived from polar magnetic variations and are important for the scaling of solar-terrestrial relations. The International Association of Geomagnetism and Aeronomy (IAGA) has recently endorsed a new PC index version to supersede the many previous index versions. However, the new PC index procedure has some adverse features which should be known and taken into account by users of the index. These features are discussed and alternative procedures are suggested.
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