Disturbances in the geomagnetic field recorded on February 6, 2023

Maria Chamati

Data on the variations of the geomagnetic field from three geomagnetic observatories: PAG (Bulgaria), PEG (Greece), and WIC (Austria), along with the solar wind parameters, and the Interplanetary Magnetic Field (Bz) recorded in the period February 5–6, 2023, are analyzed. Through performing spectral and comparison analyses, two types of disturbances are found. The first type manifests itself as an ultra-low-frequency wave (in the spectrum of Pc3–4 pulsations) in the horizontal components of all three stations. It starts at 00:52 UTC and lasts about 25 minutes. It represents a global phenomenon caused by changes in the values of the parameters of the solar wind. The second type occurs locally (at PAG Station) only in the east-west component of the magnetic vector. This is expressed in a smooth increase in its values as well as sharp peaks for the time interval 1:30–7:30 UTC. This is likely related to post-seismic effects in the geomagnetic field as a result of the great earthquake in the Republic of Turkey on February 6, 2023, with a magnitude of 7.8.

geomagnetic field, disturbances, ULF, spectral analysis

XI National Geophysical Conference, 9th June 2023, DOI: 10.48368/bgs-2023.1.N3

Author information:
Author: Maria Chamati
E-mail: mchamati@geophys.bas.bg
Affiliation: National Institute of Geophysics, Geodesy and Geography – Bulgarian Academy of Sciences

This study was supported by the Contract No D01-164/28.07.2022 (Project “National Geoinformation Center (NGIC))”, financed by the National Roadmap for Scientific Infrastructure 2020-2027 of Bulgaria. The results presented in this paper rely on data collected at magnetic observatories. We thank the national institutes that support them and INTERMAGNET for promoting high standards of magnetic observatory practice (www.intermagnet.org). We thank the OMNIWEB database for data provided.

How to cite:
Chamati, M. (2023). Disturbances in the geomagnetic field recorded on February 6, 2023. XI National Geophysical Conference, 9th June 2023. https://doi.org/10.48368/BGS-2023.1.N3