Response of the Ionospheric TEC to SSW and Associated Geomagnetic Storm Over the American Low Latitudinal Sector

During the sudden stratospheric warming (SSW) event in 2013, we investigated American low latitude around 75°W. We used 12 Global Positioning System (GPS) receivers, a pair of magnetometers, and NASA Thermosphere Ionosphere Mesosphere Energetics Dynamics (TIMED) satellite airglow instrument to unveil total electron content (TEC), inferred vertical drift, changes neutral composition, respectively. A major SSW characterized 2013 with main phase (7–27 January 2013) overlapped by minor geomagnetic storm (17 2013). The late morning downward-directed E X B drift did not support varying equatorial ionization anomaly (EIA) signature during onset (7 mid-January (15–16 witnessed enhancement upward-directed at both hemispheres. On 17 there were reductions Generally, effect on TEC 15–16 is more pronounced than onset. 2013), higher northern EIA crests are facilitated majorly compared photo-ionization that primarily enabled southern crests. combined contribution was responsible for slight reduction crest. In hemisphere, played lead role as SSW, roles secondary enhancing