  A previous work of ours found the best agreement between EUV light curves
observed in an active region core (with evidence of super-hot plasma) and those
predicted from a model with a random combination of many pulse-heated strands
with a power-law energy distribution. We extend that work by including
spatially resolved strand modeling and by studying the evolution of emission
along the loops in the EUV 94 A and 335 A channels of the Atmospheric Imaging
Assembly on-board the Solar Dynamics Observatory. Using the best parameters of
the previous work as the input of the present one, we find that the amplitude
of the random fluctuations driven by the random heat pulses increases from the
bottom to the top of the loop in the 94 A channel and, viceversa, from the top
to the bottom in the 335 A channel. This prediction is confirmed by the
observation of a set of aligned neighbouring pixels along a bright arc of an
active region core. Maps of pixel fluctuations may therefore provide easy
diagnostics of nano-flaring regions.
