Abstract
It has been shown theoretically that low-frequency 1/\ensuremath{\omega} temperature fluctuations in metal films may be observed only in the presence of nonlinear Joule heating in them. A qualitative explanation of nonmonotonic Hooge 'constant'---the mean-temperature dependence for metal (Ag, Cu) films---is proposed. It has been proven that a one-to-one connection between 1/\ensuremath{\omega} fluctuations and the instability of mean-temperature profiles in Joule-heated metal films takes place. The simultaneous appearance of a 'spatial' flicker noise 1/\ensuremath{\kappa} for \ensuremath{\kappa}\ensuremath{\rightarrow}0 (\ensuremath{\kappa} is the wave number) and the 1/\ensuremath{\omega} spectrum was established in this case.
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