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Impulsive nanoflares are expected to transiently heat the plasma confined incoronal loops to temperatures of the order of 10 MK. Such hot plasma is hardlydetected in quiet and active regions, outside flares. During rapid and shortheat pulses in rarified loops the plasma can be highly out of equilibrium ofionization. Here we investigate the effects of the non-equilibrium ofionization (NEI) on the detection of hot plasma in coronal loops.Time-dependent loop hydrodynamic simulations are specifically devoted to thistask, including saturated thermal conduction, and coupled to the detailedsolution of the equations of ionization rate for several abundant elements. Inour simulations, initially cool and rarified magnetic flux tubes are heated to10 MK by nanoflares deposited either at the footpoints or at the loop apex. Wetest for different pulse durations, and find that, due to NEI effects, the loopplasma may never be detected at temperatures above ~5 MK for heat pulsesshorter than about 1 min. We discuss some implications in the framework ofmulti-stranded nanoflare-heated coronal loops.

Non-equilibrium of Ionization and the Detection of Hot Plasma in Nanoflare-heated Coronal Loops