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In a recent paper [M. A. J. H. Ossendrijver, A&A {\bf 359}, 364 (2000)]numerical simulations of a 2D mean--field model where shown to produce grandminima, typical of the long-term behavior of solar magnetic activity. The modelconsisted of dynamo that features an $\alpha$ effect based on the buoyancyinstability of magnetic fluxtubes, which gives rise to the switching back andforth from grand minima to ``regular'' solar behavior. In this Letter, wereport evidence from a time-series analysis of the model for the presence ofcrisis--induced intermittency due to attractor--widening. We support thisfinding by showing that the average duration of the minima, $<\tau>$, followsthe theoretically predicted scaling $<\tau> \sim(C_{\delta\alpha}-C_{\delta\alpha}^*)^{-\gamma}$, where $C_{\delta\alpha}$ isthe bifurcation parameter of interest, together with other statisticalevidence. As far as we are aware, this is the first time concrete and detailedevidence has been produced for the occurrence of this type of crisis--inducedintermittency -- due to attractor widening -- for such dynamo models.

Crisis-Induced Intermittency Due to Attractor-Widening in a Buoyancy-Driven Solar Dynamo