VCANSVisually Coupled Attack & Navigation System
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Another important system for the interior of Northeast Brazil is VCANs which form over the South Atlantic Ocean and have an impact near the coast of Northeast Brazil.
In the A3 area, corresponding to eastern Northeast Brazil, the presence of VCANs is also observed; however, their influence depends largely on the location of the center of the vortex.
These significant events can be caused by disturbances in other systems patterns known as the Intertropical Convergence Zone (ITCZ) [8], Upper Tropospheric Cyclonic Vortex (VCAN) [9], disturbances in the trade winds [10], squall lines [11], front systems in southern of NEB [12], and South Atlantic Convergence Zone (SACZ) [13].