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  1. Ionospheric Responses to CME- and CIR-Driven Geomagnetic Storms Along 30°E-40°E Over the African Sector From 2001 to 2015
  2. Midlatitude ionospheric changes to four great geomagnetic storms of solar cycle 23 in Southern and Northern Hemispheres
  3. Statistical analysis of the ionospheric response during geomagnetic storm conditions over South Africa using ionosonde and GPS data