Abstract
Variability research results on the radio source 3C120 are presented using the data from international geodetic very-long-baseline interferometry (VLBI) observations at 2 and 8 GHz, the ongoing monitoring programme within the frequency range 4.8–36 GHz being carried out at the Crimean Astrophysical Observatory (Ukraine) and the Radio Astronomy Observatory of Michigan University (USA). The joint analysis of integral flux variations and milliarcsecond structures allowed us to detect flares at high frequencies accompanied by the appearance of new VLBI components seen at centimetre wavelengths. It is found that the flux variations of 3C120 at different frequencies are almost simultaneous, and the outburst in 1998 is accompanied by the birth of a new superluminal component. An activity cycle scenario based on the flux variation and structure analysis is discussed.
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