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In the present work we show new results regarding equatorial counterelectrojet (CEJ) events in the Brazilian sector, based on the RESCO radar,two set of fluxgate magnetometer systems and a digital sounder. RESCO radaris a 50 MHz backscatter coherent radar installed in 1998 at SãoLuís (SLZ, 2.33° S, 44.60° W), an equatorial site. The Digitalsounder routinely monitors the electron density profile at the radar site.The magnetometer systems are fluxgate-type installed at SLZ and Eusébio(EUS, 03.89° S, 38.44° W). From the difference between thehorizontal component of magnetic field at SLZ station and the same componentat EUS (EEJ ground strength) several cases of westward morning electrojetand its normal inversion to the eastward equatorial electrojet (EEJ) havebeen observed. Also, the EEJ ground strength has shown some cases of CEJevents, which been detected with the RESCO radar too. Detection of theseevents were investigated with respect to their time and height ofoccurrence, correlation with sporadic E (Es) layers at the same time, andtheir spectral characteristics as well as the radar echo power intensity

Counter electrojet features in the Brazilian sector: simultaneous observation by radar, digital sounder and magnetometers