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We report flux-resolved spectroscopic analysis of the active galactic nucleus(AGN) ESO 103--035 using \textit{NuSTAR} observations. Following an earlierwork, we fit the spectra using a thermal Comptonization model with arelativistic reflection component to obtain estimates of the coronaltemperature for two flux levels. The coronal temperature was found to increasefrom 24.0$^{+6.8}_{-3.4}$ to 55.3$^{+54.6}_{-7.2}$ keV (errors at 1-$\sigma$confidence level) as the flux increased from $9.8$ to $11.9 \times 10^{-11}$erg cm$^{-2}$ s$^{-1}$ in the 3--78 keV band. A marginal variation in the highenergy photon index allows for both, a non-varying optical depth and for theoptical depth to have varied by a factor of $\sim$2. This is in contrast to aprevious work on \textit{NuSTAR} flux resolved spectroscopy of the AGN, Ark564, where the temperature was found to decrease with flux along with a $10$\%variation in the optical depth. The results maybe understood in a frameworkwhere AGN variability is either dominated by coronal heating variation leadingto correlated increase of temperature with flux and the opposite effect beingseen when the variability is dominated by changes in the seed photon flux.

Evidence for coronal temperature variation in Seyfert 2 ESO 103--035 using NuSTAR observations