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This paper presents a statistical analysis of ionospheric response over ionosonde stations Grahamstown (33.3\textdegreeS, 26.5\textdegreeE, geographic) and Madimbo (22.4\textdegreeS, 30.9\textdegreeE, geographic), South Africa, during geomagnetic storm conditions which occurred during the period 1996\textendash2011. Such a climatological study is important in establishing local ionospheric behavior trend which later forms a basis for accurate modeling and forecasting electron density and critical frequency of the\ Published by: Space Weather Published on: 09/2015 YEAR: 2015   DOI: 10.1002/swe.v13.910.1002/2015SW001218
Published by: Space Weather Published on: 09/2015
YEAR: 2015   DOI: 10.1002/swe.v13.910.1002/2015SW001218
In this article, the propagation characteristics of large-scale traveling ionospheric disturbances (LS TIDs) are estimated during the geomagnetic storm periods of 14\textendash16 May 2005 and 25\textendash27 September 2011 over South Africa. One and two GPS arrays have been independently considered for the storms of 15 May 2005 and 26 September 2011, respectively. The average periods of dominant modes (≈ 2.5\textendash3.5h) in the time series data were determined by applying wavelet analysis on both ionosonde and GPS da ...
Published by: Journal of Geophysical Research: Space Physics Published on: 12/2013
YEAR: 2013   DOI: 10.1002/2013JA018997
The solar wind effects on the Earth\textquoterights environment are studied for their basic scientific values and crucial practical impacts on technological systems. This paper reports results of Total Electron Content (TEC) changes during two successive ionospheric storms of 7\textendash12 November 2004 using GPS data derived from dual frequency receivers located at African equatorial and midlatitudes. In the geographic coordinate system, equatorial TEC variability is considered over Libreville (0.36\textdegreeN, 9.67\te ...
Published by: Journal of Atmospheric and Solar-Terrestrial Physics Published on: 09/2013
YEAR: 2013   DOI: 10.1016/j.jastp.2013.05.008