  In this work, we analysed the physical parameters of the spotless actives
regions observed during solar minimum 23 - 24 (2007 - 2010). The study was
based on radio maps at 17~GHz obtained by the Nobeyama Radioheliograph (NoRH)
and magnetograms provided by the Michelson Doppler Imager (MDI) on board the
Solar and Heliospheric Observatory (SOHO). The results shows that the spotless
active regions presents the same radio characteristics of a ordinary one, they
can live in the solar surface for long periods (>10 days), and also can present
small flares.
