In this paper, we study the hydrodynamic instabilities between two concentric spheres, the inner rotating while the outer is at rest, through visualization and electrodiffusion technique. The exploration of the flow regimes is carried out for different values of the Taylor number Ta and the aspect ratio Gamma, but with one dimensionless gap width delta = 0.107. The bifurcation diagram of the flow is determined by classical visualization. On the other hand, by means of electrodiffusion technique, we measured the friction factor at the inner wall of the outer sphere. Time series obtained by the electrodiffusion technique, using FFT, permitted the identification of the fundamental frequencies and confirmed part of the bifurcation diagram obtained by the classical visualization.