J.M. Gonzalez, M. Navarro, C. Puente, J. Romeu and A. Aguasca Measurements: To verify the active region scalability predicted by the numerical simulations, an electromagnetic-field measurementtechnique based on infra-red thermograms was used. 'Infra-red thermography is a technique based on the measurement of the transformation into heat of energy absorbed by a lossy material when an electromagn...