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Despite its prediction over two decades ago, the detection of faint,high-temperature ("hot") emission due to nanoflare heating in non-flaringactive region cores has proved challenging. Using an efficient two-fluidhydrodynamic model, this paper investigates the properties of the emissionexpected from repeating nanoflares (a nanoflare train) of varying frequency aswell as the separate heating of electrons and ions. If the emission measuredistribution ($\mathrm{EM}(T)$) peaks at $T = T_m$, we find that$\mathrm{EM}(T_m)$ is independent of details of the nanoflare train, and$\mathrm{EM}(T)$ above and below $T_m$ reflects different aspects of theheating. Below $T_m$ the main influence is the relationship of the waiting timebetween successive nanoflares to the nanoflare energy. Above $T_m$ power-lawnanoflare distributions lead to an extensive plasma population not present in amonoenergetic train. Furthermore, in some cases characteristic features arepresent in $\mathrm{EM}(T)$. Such details may be detectable given adequatespectral resolution and a good knowledge of the relevant atomic physics. In theabsence of such resolution we propose some metrics that can be used to inferthe presence of "hot" plasma.

Inference of Heating Properties from "Hot" Non-flaring Plasmas in Active Region Cores. II. Nanoflare Trains