Effects of the 14 October 2023 annular solar eclipse in the Brazilian equatorial and low latitude ionosphere

This study investigates the ionospheric response to the 14 October 2023 annular solar eclipse using data from stations de-ployed in the Brazilian equatorial and low latitudes. While most research focuses on total electron content (TEC) and ionizationreduction, this work uniquely examines the temporal evolution of fixed-frequency isolines (3–8 MHz) to evaluate variationsin the vertical motion and structural dynamics of the ionosphere. Observations were conducted at three stations with varying5degrees of obscuration i.e., Araguatins (89%), Jataí (55%), and São José dos Campos (38%).