The Terella (little Earth) is generaly a model of a spherical object with a dipolar magnetic field. When the object is covered with metal and connected to a high voltage in low-pressure atmosphere, a discharge occurs. Electric and magnetic fields cross each other in general angle (they are parallelat the poles and orthogonal to each other in the equatorial plane) and thus this model allows us to study various aspects of plasma behaviour. The student is supposed to use diverse methods (electrical characteristics, ICCD, OES, etc.) to analyse the plasma generated in Terella configuration.