## 7 Data Provision  
Digital geomagnetic data were deployed and maintained by the following institutes:  
* AANII--Arctic and Antarctic Research Institute, Rosgidromet, Saint-Petersburg;
* GC--Geophysical Center, Russian Academy of Sciences, Moscow;
* IKIR--Institute of Cosmophysics and Radiowaves, Russian Academy of Sciences, Kamchatka;
* IKFIA--Institute of Cosmophysical Research and Aeronomy, Siberian Branch of Russian Academy of Sciences, Yakutsk;
* ISZF--Institute of Solar-Terrestrial Physics, Siberian Branch of Russian Academy of Sciences, Irkutsk;
* IZMIRAN--Institute of Terrestrial Magnetism and Radiowaves, Russian Academy of Sciences, Moscow;
* PGI--Polar Geophysical Institute, Kola Scientific Center of Russian Academy of Science; Apatity.  
The data of the GIC monitoring system along the power transmission line at the Kola Peninsula are at ([[http://www.eurisgic.org](http://www.eurisgic.org)]([http://www.eurisgic.org](http://www.eurisgic.org)), accessed on 18 February 2022).  
The data of some stations from the database are available on the SuperMAG portal ([[https://supermag.jhuapl.edu](https://supermag.jhuapl.edu)]([https://supermag.jhuapl.edu](https://supermag.jhuapl.edu)), accessed on 18 February 2022), the INTERMAGNET network ([[https://www.intermagnet.org](https://www.intermagnet.org)]([https://www.intermagnet.org](https://www.intermagnet.org)), accessed on 18 February 2022), and the IMAGE ([[https://space.fmi.fi/image](https://space.fmi.fi/image)]([https://space.fmi.fi/image](https://space.fmi.fi/image))) and MAGDAS ([[http://www.serc.kyushu-u.ac.jp/magdas](http://www.serc.kyushu-u.ac.jp/magdas)]([http://www.serc.kyushu-u.ac.jp/magdas](http://www.serc.kyushu-u.ac.jp/magdas)), accessed on 18 February 2022) arrays.  
Part of the data were taken from the Common Data Center \"Analytical Center for Geomagnetic Data\" ([[http://ckp.gcras.ru](http://ckp.gcras.ru)]([http://ckp.gcras.ru](http://ckp.gcras.ru)), accessed on 18 February 2022).  
The parameters of interplanetary space are taken from the OMNI database ([[https://omniweb.gsfc.nasa.gov](https://omniweb.gsfc.nasa.gov)]([https://omniweb.gsfc.nasa.gov](https://omniweb.gsfc.nasa.gov)), accessed on 18 February 2022).  
The description of the IMAG-2002 format is at ([[https://www.ngdc.noaa.gov/IMGA/vdat/IAGA2002/](https://www.ngdc.noaa.gov/IMGA/vdat/IAGA2002/)]([https://www.ngdc.noaa.gov/IMGA/vdat/IAGA2002/](https://www.ngdc.noaa.gov/IMGA/vdat/IAGA2002/)), accessed on 18 February 2022).  
Conceptualization and writing--V.A.P., data processing and analysis--O.V.K.; telluric field modeling and mapping--E.E.M.; review and editing--E.Y.S.; database maintenance--M.N.D. All authors have read and agreed to the published version of the manuscript.  
**Funding:** This research was supported by the Russian Science Foundation grant 21-77-30010 (OK, VP, MD), and by project 314670 of the Academy of Finland (EM).  
**Informed Consent Statement:** Not applicable.  
**Data Availability Statement:** The entire database is freely available on the anonymous FTP site [[ftp://door.gcras.ru/ftp_anonymous/ARCTICA_Rus](ftp://door.gcras.ru/ftp_anonymous/ARCTICA_Rus)]([ftp://door.gcras.ru/ftp_anonymous/ARCTICA_Rus](ftp://door.gcras.ru/ftp_anonymous/ARCTICA_Rus)) accessed on 18 February 2022. The usage of the database must be referenced [[https://doi.org/10.2205/Rus-Arctic-1-min-DB](https://doi.org/10.2205/Rus-Arctic-1-min-DB)]([https://doi.org/10.2205/Rus-Arctic-1-min-DB](https://doi.org/10.2205/Rus-Arctic-1-min-DB)).  
**Acknowledgments:** We appreciate useful discussions with [PERSON] and help from [PERSON].  
**Conflicts of Interest:** The authors declare no conflict of interest.