Investigation of Ionospheric Response to Two Moderate Geomagnetic Storms Using GPS-TEC Measurements in the South American and African Sectors during the Ascending Phase of Solar Cycle 24,
de Abreu, A. J., P. R. Fagundes, M. Gende, et al. (2014),
Advances in Space Research, 53 p. 1313–1328,
10.1016/j.asr.2014.02.011.