Amplitude signal scintillations during ionospheric<br>irregularities, measured by an array of modified GPS<br>(Global Positioning System) receivers, over the brazilian<br>sector, was used to study the effects of magnetic<br>activity and equatorial anomaly over their percentage<br>of occurrence and intensity. It was observed<br>that there is a decrease of percentage of scintillation<br>occurrence during high magnetic activity in the premidnight<br>sector mainly during moderate and high<br>solar flux, but not during low solar flux. Some strong<br>storms triggered ionospheric irregularities during<br>periods out of spread-F season. The effect of equatorial<br>anomaly is to increase the magnitude of scintillations<br>due to the higher ambient plasma density.


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