  We study the intermittent behavior of the energy decay and linear magnetic
response of a glassy system during isothermal aging after a deep thermal quench
using the Edward-Anderson spin glass model as a paradigmatic example. The large
intermittent changes in the two observables are found to occur in a correlated
fashion and through irreversible bursts, `quakes', which punctuate reversible
and equilibrium-like fluctuations of zero average. The temporal distribution of
the quakes it found to be a Poisson distribution with an average growing
logarithmically on time, indicating that the quakes are triggered by record
sized fluctuations. As the drift of an aging system is to a good approximation
subordinated to the quakes, simple analytical expressions (Sibani et al. Phys
Rev B 74, 224407, 2006) are available for the time and age dependence of the
average response and average energy. These expressions are shown to capture the
time dependencies of the EA simulation results. Finally, we argue that whenever
the changes of the linear response function and of its conjugate
autocorrelation function follow from the same intermittent events a
fluctuation-dissipation-like relation can arise between the two in
off-equilibrium aging.
