  Decaying and periodically kicked turbulence are analyzed within the GOY shell
model, to allow for sufficiently large scaling regimes. Energy is transfered
towards the small scales in intermittent bursts. Nevertheless, mean field
arguments are sufficient to account for the ensemble averaged energy decay E(t)
\~t^{-2} or the parameter dependences for the ensemble averaged total energy in
the kicked case. Within numerical precision, the inertial subrange
intermittency remains the same, whether the system is forced or decaying.
