Total ionospheric electron content from GPS measurements over the Brazilian region

Abstract

Due to the effect of the ionosphere on the propagation of the electromagnetic waves transmitted by the GPS satellites, in 1575.42 and 1227.60 MHz, it is possible to obtain the total ionospheric electron content (TEC). We present the methodology used to obtain diurnal and latitudinal variations of vertical TEC over the Brazilian region with data from Global Positioning System (GPS) dual frequency receivers. Some preliminary results are presented and a new method to obtain instrumental delays is proposed.