0472207 - ÚFA 2017 RIV US eng J - Článek v odborném periodiku
Matamba, T. M. - Habarulema, J. B. - Burešová, Dalia
Midlatitude ionospheric changes to four great geomagnetic storms of solar cycle 23 in Southern and Northern Hemispheres.
Space Weather-the International Journal of Research and Applications. Roč. 14, č. 12 (2016), s. 1155-1171. ISSN 1542-7390. E-ISSN 1542-7390
Grant CEP: GA ČR(CZ) GAP209/12/2440
Institucionální podpora: RVO:68378289
Klíčová slova: total electron-content * traveling atmospheric disturbances * November 2004 superstorms * magnetic storms * interplanetary origins * equatorial ionosphere * neutral composition * physical-mechanism * middle latitudes * content response
Kód oboru RIV: DG - Vědy o atmosféře, meteorologie
Impakt faktor: 2.581, rok: 2016 ; AIS: 0.813, rok: 2016
Web výsledku:
http://onlinelibrary.wiley.com/doi/10.1002/2016SW001516/abstractDOI: https://doi.org/10.1002/2016SW001516

This paper presents an investigation of ionospheric response to great (Dst ≤−350 nT) geomagnetic storms that occurred during solar cycle 23. The storm periods analyzed are 29 March to 2 April 2001, 27–31 October 2003, 18–23 November 2003, and 6–11 November 2004. Global Navigation Satellite System, total electron content (TEC), and ionosonde critical frequency of F2 layer (foF2) data over Southern Hemisphere (African sector) and Northern Hemisphere (European sector) midlatitudes were used to study the ionospheric responses within 15°E–40°E longitude and ±31° to ±46° geomagnetic latitude. Midlatitude regions within the same longitude sector in both hemispheres were selected in order to assess the contribution of the low-latitude changes especially the expansion of equatorial ionization anomaly (EIA) also called the dayside ionospheric superfountain effect during these storms. In all storm periods, both negative and positive ionospheric responses were observed in both hemispheres. Negative ionospheric responses were mainly due to changes in neutral composition, while the expansion of the EIA led to pronounced positive storm effects at midlatitudes for some storm periods. In other cases (e.g., 29 October 2003), penetration electric fields, EIA expansion, and large-scale traveling ionospheric disturbances were found to be present during the positive storm effect at midlatitudes in both hemispheres. An increase in TEC on the 28 October 2003 was because of the large solar flare with previously determined intensity of X45 ±5.
Trvalý link: http://hdl.handle.net/11104/0269556