Strong radio flaring period in UXArietis

In January 1993 we observed the RSCVn-type binary system UX Ari at 6 cm using the 32m radiotelescope of Noto, with a temporal coverage of about 12 hours per day. The sourcewas found to be in a very active period, with a continuous series of radio flares of flux densities up to 350mJy. The analysis of the data shows that the radio emission consists of two different components: a continuous series of strong radio flares and an orbital phase dependent component, with a minimum of emission around phase Φ = 0.5. The amplitude of the radioflares and their timeof occurrence do not depend on the orbital phase, suggesting that the region where they originate is always visible from Earth. Abright and stable active region, localized in the hemisphere of the K star not visible from the G star, seems to account for the orbital phase dependence of the radio emission.