Statistical Study of Geomagnetic Disturbances at European Auroral and High Latitudes

Authors

  • Rolf Werner Space Research and Technology Institute, Bulgarian Academy of Sciences, Stara Zagora Department
  • Veneta Guineva Space Research and Technology Institute, Bulgarian Academy of Sciences, Stara Zagora Department
  • Irina Despirak Polar Geophysical Institute, Russia
  • Andris Lyubchich Polar Geophysical Institute, Russia
  • Rumiana Bojilova National Institute of Geophysics, Geodesy and Geography Bulgarian Academy of Sciences
  • Lyubomira Raykova Space Research and Technology Institute, Bulgarian Academy of Sciences, Stara Zagora Department
  • Atanas Atanassov Space Research and Technology Institute, Bulgarian Academy of Sciences, Stara Zagora Department
  • Dimitar Valev Space Research and Technology Institute, Bulgarian Academy of Sciences, Stara Zagora Department

DOI:

https://doi.org/10.7546/CRABS.2023.04.09

Keywords:

geomagnetic disturbances, extreme value statistics, occurrence rate

Abstract

Statistical studies allow probability statements about the frequency of certain events. The occurrence of magnetic substorms and their activity have been described with the help of extreme value distributions in the last few decades using the auroral electrojet indices AE, AL and AU. In this work we examined the distribution of the IL index, derived from observations at stations of the IMAGE magnetometer network. The distributions of magnetic disturbances, based on IL, were studied separately in the morning (3–9 MLT), day (9–15 MLT), evening (15–21 MLT), and night (21–3 MLT) sectors. In addition, we used the values of the IL index calculated from the meridional chains in the auroral zone (PPN-SOR) and from the chain of stations at high latitudes (BJN-NAL). The histograms, the empirical cumulative distributions and the occurrence rates were computed. It was shown that the empirical distributions could be well approximated with exponential distributions. The distribution parameters were determined from the occurrence rates. Three classes were discovered, which differ significantly by the respective distribution parameters. Structural changes in the distributions were found in the morning sector at both auroral and high latitudes. The relationship between the occurrence rate of magnetic disturbances with IL < −1000 nT and the frequency of occurrence of geomagnetic induced currents was highlighted.

Author Biographies

Rolf Werner, Space Research and Technology Institute, Bulgarian Academy of Sciences, Stara Zagora Department

Mailing Address:
Space Research and Technology Institute,
Bulgarian Academy of Sciences,
Stara Zagora Department
Bulgaria

E-mail: rolwer52@yahoo.co.uk

Veneta Guineva, Space Research and Technology Institute, Bulgarian Academy of Sciences, Stara Zagora Department

Mailing Address:
Space Research and Technology Institute,
Bulgarian Academy of Sciences,
Stara Zagora Department
Bulgaria

E-mail: v_guineva@yahoo.com

Irina Despirak, Polar Geophysical Institute, Russia

Mailing Address:
Polar Geophysical Institute (PGI)
Apatity, Russia

E-mail: despirak@gmail.com

Andris Lyubchich, Polar Geophysical Institute, Russia

Mailing Address:
Polar Geophysical Institute (PGI)
Apatity, Russia

E-mail: lubchich@pgia.ru

Rumiana Bojilova, National Institute of Geophysics, Geodesy and Geography Bulgarian Academy of Sciences

Mailing Address:
National Institute of Geophysics,
Geodesy and Geography
Bulgarian Academy of Sciences
Akad. G. Bonchev St, Bl. 3
1113 Sofia, Bulgaria

E-mail: rbojilova@geophys.bas.bg

Lyubomira Raykova, Space Research and Technology Institute, Bulgarian Academy of Sciences, Stara Zagora Department

Mailing Address:
Space Research and Technology Institute,
Bulgarian Academy of Sciences,
Stara Zagora Department
Bulgaria

E-mail: heiti456@gmail.com

Atanas Atanassov, Space Research and Technology Institute, Bulgarian Academy of Sciences, Stara Zagora Department

Mailing Address:
Space Research and Technology Institute,
Bulgarian Academy of Sciences,
Stara Zagora Department
Bulgaria

E-mail: at_m_atanassov@yahoo.com

Dimitar Valev, Space Research and Technology Institute, Bulgarian Academy of Sciences, Stara Zagora Department

Mailing Address:
Space Research and Technology Institute,
Bulgarian Academy of Sciences,
Stara Zagora Department
Bulgaria

E-mail: valev@gbg.bg

Downloads

Published

30-04-2023

How to Cite

[1]
R. Werner, “Statistical Study of Geomagnetic Disturbances at European Auroral and High Latitudes”, C. R. Acad. Bulg. Sci., vol. 76, no. 4, pp. 571–579, Apr. 2023.

Issue

Section

Space Sciences