HR: 14:00h
AN: A53C-01    [Abstracts]
TI: TEC Behavior in the Low Latitude Brazilian Area Using GPS Observables
AU: * Aguiar, C R
EM: rodrigues.aguiar@gmail.com
AU: Camargo, P d
EM: paulo@fct.unesp.br
AB: GPS has definitely established as an important tool for the determination observation of atmosphere parameters. After the turn off the SA (Selective Availability) the ionosphere influence became the largest error source on the band L signals broadcasted by the GPS satellites. The signal that travels across the ionosphere allows obtaining information of the ionosphere layers. The code delay and phase advance on propagation of GPS signals reflect the behavior of the ionosphere as function of TEC (Total Electron Content). It is influenced by several variables, such as: solar cycle, time of the year, hour of the day, geographic location and geomagnetic activity. Lately, the TEC determination has also been made with double frequency GPS data measurements. In Brazil, the RMBC (Network Brazilian for Continuous Monitoring of GPS) is equipped with dual frequency GPS receivers that register GPS data continually. Therefore, this network can be considered a significant database of atmosphere information to the ionosphere activity. In this paper it is presented and discussed the seasonal behavior and diurnal effects of TEC in low latitude, specifically in the Brazilian area. This study is based on the VTEC (Vertical Total Electron Content) obtained from the linear combination of dual frequency GPS observables. In the experiments were used RBMC's data in the high activity period, in the solar cycle 23 (2000), and in the period of decline of the solar activity (2006). The results show the behavior of the VTEC in period of high and low solar activity.
DE: 2400 IONOSPHERE (6929)
DE: 2415 Equatorial ionosphere
SC: Atmospheric Sciences [A]
MN: 2007 Joint Assembly