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\begin{document}

\title{The polar cap (PC) index: PCS version based on Dome-C data}



\author[1]{Peter Stauning}%
\affil[1]{Danish Meteorological Institute}%


\vspace{-1em}



  
  \date{May 23, 2024}


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\begin{abstract}
The standard Polar Cap (PC) indices, PCN (North) based on magnetic data
from Qaanaaq in Greenland and PCS (South) based on data from Vostok in
Antarctica, have been submitted from the Arctic and Antarctic Research
Institute (AARI) in St. Petersburg, Russia, the Danish Meteorological
Institute (DMI), and the Danish Space Research Institute (DTU Space) in
different versions. In order to consolidate PCS indices based on Vostok
data or replace poor or missing index data, derivation procedures have
been developed to generate alternative PCS index values based on data
from Dome Concordia (Dome-C) magnetic observations from epoch 2009-2020
of solar cycle 24. The reference levels and calibration parameters
needed for calculations of Dome-C-based PCS values in post-event and
real-time versions are defined and explained in the present work.
Assessment of the new PCS index has shown its unprecedented high
relevance. Part of the methods used here such as the quiet reference
level construction and the correlation and regression procedures used
for calculations of scaling parameters deviate from corresponding
features considered inadequate of the IAGA-endorsed PC index derivation
methods%
\end{abstract}%



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