Articles | Volume 35, issue 6
Ann. Geophys., 35, 1309–1326, 2017

Special issue: Space weather connections to near-Earth space and the...

Ann. Geophys., 35, 1309–1326, 2017

Regular paper 07 Dec 2017

Regular paper | 07 Dec 2017

Total electron content responses to HILDCAAs and geomagnetic storms over South America

Patricia Mara de Siqueira Negreti et al.

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The total electron content (TEC) is being extensively used to monitor the ionospheric behavior under geomagnetically quiet and disturbed conditions. The TEC presents significant changes during geomagnetic disturbed periods, causing degradation of signals in navigation systems and satellite communication. The geomagnetically disturbed periods occur due to enhanced solar activity and we show that the TEC presents intensifications not only during geomagnetic storms but also during HILDCAA events.