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We investigate the association between the radio ``plateau'' states and thelarge superluminal flares in GRS 1915+105 and propose a qualitative scenario toexplain this association. We identify several candidate superluminal flareevents from available monitoring data on this source and analyze thecontemporaneous RXTE pointed observations. We detect a strong correlationbetween the average X-ray flux during the ``plateau'' state and the totalenergy emitted in radio during the subsequent radio flare. We find that thesequence of events is similar for all large radio flares with a fast rise andexponential decay morphology. Based on these results, we propose a qualitativescenario in which the separating ejecta during the superluminal flares areobserved due to the interaction of the matter blob ejected during the X-raysoft dips, with the steady jet already established during the ``plateau''state. This picture can explain all types of radio emission observed from thissource in terms of its X-ray emission characteristics.Comment: Corrected typo in the author names, contents unchanged, accepted in  Ap

On the Origin of the Various Types of Radio Emission in GRS 1915+105