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In this paper, the critical frequency of F2 layer (foF2) and their peak height (hmF2) recorded at equatorial and low latitude stations of the South American sector were analyzed during the 19\textendash22 December 2015 geomagnetic storm period. We have observed initially decreases of foF2 at equatorial and low latitudes over the North crest of the equatorial ionization anomaly (EIA) and almost no effect over the South crest. These initial negative storm effects can be fully explained by the penetration of a westward elect ...
YEAR: 2019   DOI: 10.1016/j.asr.2019.09.025
A global study is made of the response of the total electron content of the ionosphere (TEC) to the geomagnetic storm occurred on 22 June 2015 (one of the strongest geomagnetic storms of the current Solar Cycle 24). Using data from 44 sites, a hemispheric comparison is made by considering high latitudes (\>\ 50\textdegree), middle latitudes (30\textdegree\textendash50\textdegree) and low latitudes (30\textdegreeN\textendash30\textdegreeS). The main features observed were: increases in TEC at high latitudes prior t ...
YEAR: 2018   DOI: 10.1007/s00024-017-1741-5