THREE GEOMAGNETIC STORMS IN JANUARY 2005 AND THEIR IMPACT ON TOTAL ELECTRON CONTENT
Bulgarian Geophysical Journal, 2018, Vol. 41, DOI: https://doi.org/10.34975/bgj-2018.41.4
This study presents the global and mid-latitude ionospheric response to three geomagnetic storms occurred in January 2005: the first one on 7-8 January, the second one on 17-19 January, and the last one on 21-22 January. This period has been selected, because no major sudden stratospheric warming (SSW) occurred during this month and according to many scientists this winter is represented as an example of a background reference case corresponding to a ‘normal’ year. Therefore, the observed ionospheric response to the considered geomagnetic storms could be attributed mainly to the external forcing. The reaction is explored by considering N(h) profiles registered by manually scaled ionosonde measurements at station Sofia (42.5°N, 25°E), which are used for calculating the total electron content (TEC) up to the F2-layer maximum (bottom-TEC). The full-TEC data are provided by the Center for Orbit Determination of Europe (CODE)-Bern, for the nearest point to Sofia. The main aim of this work is to compare in details the temporal variability of the full-TEC with bought that below (bottom-TEC) and up (top-TEC) the F2-layer maximum for each of the considered geomagnetic storms. It is found that for all investigated geomagnetic storms in January 2005 the bottom-TEC is considerably different from bought top-TEC and full-TEC. An explanation of the main mechanisms responsible for the observed difference has been proposed.
geomagnetic activity, TEC, ionospheric anomalies.
This work was supported by the Bulgarian Ministry of Education and Science under the National Research Programme “Young scientists and postdoctoral students” approved by DCM №577 / 17.08.2018 and by Contract No D01-161/28.08.2018 (Project “National Geoinformation Center (NGIC)” financed by the National Roadmap for Scientific Infrastructure 2017-2023.
Author: Rumiana Bojilova
Affiliation: National Institute of Geophysics, Geodesy and Geography – BAS, str. Acad. G. Bonchev, bl. 3, Sofia 1113, Bulgaria
How to cite:
Bojilova, R. (2019). THREE GEOMAGNETIC STORMS IN JANUARY 2005 AND THEIR IMPACT ON TOTAL ELECTRON CONTENT. Bulgarian Geophysical Journal, Vol. 41, p. 36-45. https://doi.org/10.34975/BGJ-2018.41.4