= Guido Boffetta
{c}
<Guido Boffetta> is a physicist whose research includes <turbulence> and nonlinear <dynamical systems>. His University of Turin profile identifies work in turbulence research groups and projects on extreme events in turbulent <convection>.<Guido Boffetta profile by the University of Turin>[research groups and projects]{ref}
A 1999 first-authored paper with <Vincenzo Carbone>, <Pierluigi Veltri> and other collaborators tested models of <solar flares> using the time between successive bursts. Twenty years of observations showed a <power law> in those intervals, with an exponent near $2.4$. The comparison challenged the Poisson-like timing predicted by particular models and tested a <shell model of turbulence> against several observed distributions.<Power Laws in Solar Flares: Self-Organized Criticality or Turbulence? by Guido Boffetta and others>[abstract, quiescent times and model comparisons]{ref}
The methodological point is that matching burst sizes is different from matching burst timing. In an ideal constant-rate <Poisson process>, the probability of waiting longer than $t$ is $e^{-\lambda t}$; a persistent power-law tail has a different pattern. This supplies an additional observable with which to distinguish models. It does not mean that a fitted exponent alone uniquely identifies the physical mechanism.
\Image[https://www.campusnet.unito.it/docenti/att/gboffett.fotografia.jpg]
{title=Guido Boffetta, identified portrait on his University of Turin profile}
{description=External image from <Guido Boffetta profile by the University of Turin>.}
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