  We use numerical stochastic-viscous hydrodynamic simulations and new
analytical results from thin disc theory to probe the turbulent variability of
accretion flows, as observed at high energies. We show that the act of
observing accretion discs in the Wien tail exponentially enhances small-scale
temperature variability in the flow, which in a real disc will be driven by
magnetohydrodynamic turbulence, to large amplitude luminosity fluctuations (as
predicted analytically). In particular, we demonstrate that discs with more
spatially coherent turbulence (as might be expected of thicker discs), and
relativistic discs observed at larger inclinations, show significantly
enhancement in their Wien-tail variability. We believe this is the first
analysis of relativistic viewing-angle effects on turbulent variability in the
literature. Using these results we argue that tidal disruption events represent
particularly interesting systems with which to study accretion flow
variability, and may in fact be the best astrophysical probes of small scale
disc turbulence. This is a result of a typical tidal disruption event disc
being naturally observed in the Wien-tail and likely having a somewhat thicker
disc and cleaner X-ray spectrum than other sources. We argue for dedicated
X-ray observational campaigns of tidal disruption events, with the aim of
studying accretion flow variability.
